If reason (I mean abstract reason, derived from inquiries a priori) be not alike mute with regard to all questions concerning cause and effect, this sentence at least it will venture to pronounce, That a mental world, or universe of ideas, requires a cause as much, as does a material world, or universe of objects; and, if similar in its arrangement, must require a similar cause. For what is there in this subject, which should occasion a different conclusion or inference? In an abstract view, they are entirely alike; and no difficulty attends the one supposition, which is not common to both of them.

There are three juridical attributes that inseparably belong to the citizen by right. These are: Constitutional freedom, as the right of every citizen to have to obey no other law than that to which he has given his consent or approval; Civil equality, as the right of the citizen to recognize no one as a superior among the people in relation to himself...; and Political independence, as the right to owe his existence and continuance in society not to the arbitrary will of another, but to his own rights and powers as a member of the commonwealth.

There is no need to worry about mere size. We do not necessarily respect a fat man more than a thin man. Sir Isaac Newton was very much smaller than a hippopotamus, but we do not on that account value him less.

Struggling to be brief I become obscure.

What pride to discover that nothing belongs to you - what a revelation.

To say that authority, whether secular or religious, supplies no ground for morality is not to deny the obvious fact that it supplies a sanction.

It is the duty of the human understanding to understand that there are things which it cannot understand, and what those things are. Human understanding has vulgarly occupied itself with nothing but understanding, but if it would only take the trouble to understand itself at the same time it would simply have to posit the paradox.

A true account of the actual is the rarest poetry, for common sense always takes a hasty and superficial view.

Because of the way that myth takes it for granted that miracles are always happening, the waking life of a mythically inspired people the ancient Greeks, for instance more closely resembles a dream than it does the waking world of a scientifically disenchanted thinker.

If man of himself could in a perfect manner know all things visible and invisible, it would indeed be foolish to believe what he does not see. But our manner of knowing is so weak that no philosopher could perfectly investigate the nature of even one little fly.

The great god Pan is dead.

A whole is that which has beginning, middle, and end.

Each time I fail to think about death, I have the impression of cheating, of deceiving someone in me.

You must read Plato. But you must hold him at arm's length and say, 'Plato, you have delighted and edified mankind for two thousand years. What have you to say to me?'

Show me someone who is ill and yet happy, in danger and yet happy, dying and yet happy, exiled and yet happy. Show me such a person; by the gods, how greatly I long to see a Stoic!

But if you say: "How am I to know what he means, when I see nothing but the signs he gives?" then I say: "How is he to know what he means, when he has nothing but the signs either?"

Justice is the first virtue of those who command, and stops the complaints of those who obey.

But no mental action seems necessary or invariable in its character. In whatever manner the mind has reacted under a given sensation, in that manner it is the more likely to react again; were this, however, an absolute necessity, habits would become wooden and ineradicable, and no room being left for the formulation of new habits, intellectual life would come to a speedy close. Thus, the uncertainty of the mental law is no mere defect of it, but is on the contrary of its essence. The truth is, the mind is not subject to "law," in the same rigid sense that matter is. It only experiences gentle forces which merely render it more likely to act a given way than it otherwise would be. There always remains a certain amount of arbitrary spontaneity in its action, without which it would be dead.

[...] men are not astonish'd at the operations of their own reason, at the same time, that they admire the instinct of animals, and find a difficulty in explaining it, merely because it cannot be reduc'd to the very same principles. [...] reason is nothing but a wonderful and unintelligible instinct in our souls[.]

None can be free who is a slave to, and ruled by, his passions.

There is much pleasure to be gained from useless knowledge.

For eighteen hundred years, though perchance I have no right to say it, the New Testament has been written; yet where is the legislator who has wisdom and practical talent enough to avail himself of the light which it sheds on the science of legislation?

Certainly one may, with as much reason and decency, plead for murder, robbery, lewdness, and barbarity, as for this practice: They are not more contrary to the natural dictates of Conscience, and feelings of Humanity; nay, they are all comprehended in it.

The effect of liberty to individuals is, that they may do what they please: we ought to see what it will please them to do, before we risk congratulations.

And surely, he that hath taken the true Altitude of Things, and rightly calculated the degenerate state of this Age, is not like to envy those that shall live in the next, much less three or four hundred Years hence, when no Man can comfortably imagine what Face this World will carry.

The saying that beauty is but skin deep is but a skin-deep saying.

Our labour preserves us from three great evils -- weariness, vice, and want.

The hatefulness of a hated person is "real"-in hatred you see men as they are; you are disillusioned; but the loveliness of a loved person is merely a subjective haze concealing a "real" core of sexual appetite or economic association. Wars and poverty are "really" horrible; peace and plenty are mere physical facts about which men happen to have certain sentiments.

Money is human happiness in the abstract: he, then, who is no longer capable of enjoying human happiness in the concrete devotes his heart entirely to money.

Worte sind Taten. Words are deeds.

Man is a useless passion.

Everyday we act in ways that reflect our ethical judgements.

Too much consistency is as bad for the mind as it is for the body. Consistency is contrary to nature, contrary to life. The only completely consistent people are the dead. Consistent intellectualism and spirituality may be socially valuable, up to a point; but they make, gradually, for individual death.

Simon Peter said to Him, "Let Mary leave us, for women are not worthy of Life." Jesus said, "I myself shall lead her in order to make her male, so that she too may become a living spirit resembling you males. For every woman who will make herself male will enter the Kingdom of Heaven." (114)

Antisthenes ... was asked on one occasion what learning was the most necessary, and he replied, "To unlearn one's bad habits."

Nothing is more ancient than God, for He was never created; nothing more beautiful than the world, it is the work of that same God; nothing is more active than thought, for it flies over the whole universe; nothing is stronger than necessity, for all must submit to it.

Kant's philosophy shifts for the first time the whole of modern thought and being (Desein) into the clarity and transparency of the foundation (Begrundung). This determines every attitude toward knowledge since then, as well as the bounds (Abgrenzungen) and appraisals of the sciences in the nineteenth century up to the present time. Therein Kant towers so far above all who precede and follow that even those who reject him or go beyond him still remain entirely dependent upon him.

Correct and accurate conclusions may be arrived at if we carefully observe the relation of the spheres of concepts, and only conclude that one sphere is contained in a third sphere, when we have clearly seen that this first sphere is contained in a second, which in its turn is contained in the third. On the other hand, the art of sophistry lies in casting only a superficial glance at the relations of the spheres of the concepts, and then manipulating these relations to suit our purposes, generally in the following way: - When the sphere of an observed concept lies partly within that of another concept, and partly within a third altogether different sphere, we treat it as if it lay entirely within the one or the other, as may suit our purpose.

Only that position can impart dignity in which we do not appear as servile tools but rather create independently within our circle.

Do not fight against these harmful spells. For you do not know what God wants with them. You do not know the greater divine plan behind it all.

If beings are grasped as will to power, the "should" which is supposed to hang suspended over them, against which they might be measured, becomes superfluous. If life itself is will to power, it is itself the ground, principium, of valuation. Then a "should" does not determine being. Being determines a "should." "When we talk of values we are speaking under the inspiration or optics of life: life itself compels us to set up values; life itself values through us whenever we posit values."

Nature must not win the game, but she cannot lose. And whenever the conscious mind clings to hard and fast concepts and gets caught in its own rules and regulations-as is unavoidable and of the essence of civilized consciousness-nature pops up with her inescapable demands.

The advantage of meditating upon life and death is being able to say anything at all about them.

Consumption is the sole end and purpose of all production; and the interest of the producer ought to be attended to, only so far as it may be necessary for promoting that of the consumer.

We should, out of decency, choose for ourselves the moment to disappear.

The rich man... is always sold to the institution which makes him rich.

No natural boundary seems to be set to the efforts of man; and what is not yet done is only what he has not yet attempted to do. Variant: What is not yet done is only what we have not yet attempted to do.

The silent treasuring up of knowledge; learning without satiety; and instructing others without being wearied: which one of these things belongs to me? To keep silently in mind what one has seen and heard, to study hard and never feel contented, to teach others tirelessly; have I done (all of) these things?

In the philosophy of Mach a world without matter is unthinkable. Matter in Mach's philosophy is not merely required as a test body to display properties of something already there ...it is an essential feature in causing those properties which it able to display, Inertia, for example, would not appear by the insertion of one test body in the world; in some way the presence of other matter is a necessary condition. It will be seen how welcome to such a philosophy is the theory that space and the inertial frame come into being with matter, and grow as it grows.

The extreme nature of dominant-end views is often concealed by the vagueness and ambiguity of the end proposed.