Where knowledge is a duty, ignorance is a crime. 

A man who is so exceedingly civil that for the sake of quietude and a peaceable name will silently see the community imposed upon, or their rights invaded, may, in his principles, be a good man, but cannot be stiled a useful one, neither does he come up to the full mark of his duty; for silence becomes a kind of crime when it operates as a cover or an encouragement to the guilty. 

He who dares not offend cannot be honest.

This sacrifice of common sense is the certain badge which distinguishes slavery from freedom; for when men yield up the privilege of thinking, the last shadow of liberty quits the horizon. "Reflections on Titles", Pennsylvania Magazine

There are two distinct classes of men in the nation, those who pay taxes, and those who receive and live upon the taxes.

When the qualification to vote is regulated by years, it is placed on the firmest possible ground, because the qualification is such as nothing but dying before the time can take away; and the equality of Rights, as a principle, is recognized in the act of regulating the exercise. But when Rights are placed upon, or made dependent upon property, they are on the most precarious of all tenures. "Riches make themselves wings, and fly away," and the rights fly with them ; and thus they become lost to the man when they would be of most value.

The Theophilanthropists do not call themselves the disciples of such or such a man. They avail themselves of the wise precepts that have been transmitted by writers of all countries and in all ages.

The society adopts neither rites nor priesthood, and it will never lose sight of the resolution not to advance any thing as a society inconvenient to any sect or sects, in any time or country, and under any government. It will be seen that it is so much the more easy for the society to keep within this circle, because, that the dogmas of the Theophilanthropists are those upon which all the sects have agreed, that their moral is.that upon which there has never been the least dissent; and that the name they have taken expresses the double end of all the sects, that of leading to the adoration of God and love of man.

An army of principles will penetrate where an army of soldiers cannot; it will succeed where diplomatic management would fall: it is neither the Rhine, the Channel, nor the ocean that can arrest its progress: it will march on the horizon of the world, and it will conquer.

Despotic government supports itself by abject civilization, in which debasement of the human mind, and wretchedness in the mass of the people, are the chief criterions. Such governments consider man merely as an animal; that the exercise of intellectual faculty is not his privilege; that he has nothing to do with the laws but to obey them; and they politically depend more upon breaking the spirit of the people by poverty, than they fear enraging it by desperation.

Separate an individual from society, and give him an island or a continent to possess, and he cannot acquire personal property. He cannot be rich. So inseparably are the means connected with the end, in all cases, that where the former do not exist the latter cannot be obtained. All accumulation, therefore, of personal property, beyond what a man's own hands produce, is derived to him by living in society; and he owes on every principle of justice, of gratitude, and of civilization, a part of that accumulation back again to society from whence the whole came.

There are, in every country, some magnificent charities established by individuals. It is, however, but little that any individual can do, when the whole extent of the misery to be relieved is considered. He may satisfy his conscience, but not his heart. He may give all that he has, and that all will relieve but little. It is only by organizing civilization upon such principles as to act like a system of pulleys, that the whole weight of misery can be removed.

I care not how affluent some may be, provided that none be miserable in consequence of it. But it is impossible to enjoy affluence with the felicity it is capable of being enjoyed, while so much misery is mingled in the scene.

Men did not make the earth... It is the value of the improvements only, and not the earth itself, that is individual property... Every proprietor owes to the community a ground rent for the land which he holds.

Let us maintain inviolably equality in the sacred right of suffrage: public security can never have a basis more solid.

When we reflect on the long and dense night in which France and all Europe have remained plunged by their governments and their priests, we must feel less surprise than grief at the bewilderment caused by the first burst of light that dispels the darkness.

An avidity to punish is always dangerous to liberty. It leads men to stretch, to misinterpret, and to misapply even the best of laws. He that would make his own liberty secure must guard even his enemy from oppression; for if he violates this duty he establishes a precedent that will reach to himself.

It is the nature and intention of a constitution to prevent governing by party, by establishing a common principle that shall limit and control the power and impulse of party, and that says to all parties, thus far shalt thou go and no further. But in the absence of a constitution, men look entirely to party; and instead of principle governing party, party governs principle.

It is never to be expected in a revolution that every man is to change his opinion at the same moment. There never yet was any truth or any principle so irresistibly obvious that all men believed it at once. Time and reason must cooperate with each other to the final establishment of any principle; and therefore those who may happen to be first convinced have not a right to persecute others, on whom conviction operates more slowly. The moral principle of revolutions is to instruct, not to destroy.

The right of voting for representatives is the primary right by which other rights are protected. To take away this right is to reduce a man to slavery, for slavery consists in being subject to the will of another, and he that has not a vote in the election of representatives is in this case.

It is error only, and not truth, that shrinks from inquiry.

A thing, moderately good, is not so good as it ought to be. Moderation in temper, is always a virtue; but moderation in principle, is a species of vice.

Eloquence may strike the ear, but the language of poverty strikes the heart; the first may charm like music, but the second alarms like a knell.