"A sensible man will remember that the eyes may be confused in two ways - by a change from light to darkness or from darkness to light; and he will recognize that the same thing happens to the soul."

"If one has made a mistake, and fails to correct it, one has made a greater mistake."

"If you do not take an interest in the affairs of your government, then you are doomed to live under the rule of fools."

"The good are like one another, and friends to one another; and ... the bad, as is often said of them, are never at unity with one another or with themselves, but are passionate and restless: and that which is at variance and enmity with itself is not likely to be in union or harmony with any other thing.,."

"Misanthropy ariseth from a man trusting another without having sufficient knowledge of his character, and, thinking him to be truthful, sincere, and honorable, finds a little afterwards that he is wicked, faithless, and then he meets with another of the same character. When a man experiences this often, and more particularly from those whom he considered his most dear and best friends, at last, having frequently made a slip, he hates the whole world, and thinks that there is nothing sound at all in any of them."

"Knowledge becomes evil if the aim be not virtuous."

"Either we shall find what it is we are seeking or at least we shall free ourselves from the persuasion that we know what we do not know."

"I used to imagine that no human can make men good; but I know better now."

"Ideas are the source of all things."

"When there is an income tax, the just man will pay more and the unjust less on the same amount of income."

"If a man says that it is right to give everyone his due, and therefore thinks within his own mind that injury is due from a just man to his enemies but kindness to his friends, he was not wise who said so, for he spoke not the truth, for in no case has it appeared to be just to injure any one."

"A house that has a library in it has a soul."

"Love is of the beautiful, and therefore has not the beautiful. And the beautiful is the good, and therefore, in wanting and desiring the beautiful, love also wants and desires the good."

"Knowledge is the food of the soul."

"The like is not the friend of the like in as far as he is like; still the good may be the friend of the good in as far as he is good."

"When anything is in the presence of evil, but is not as yet evil, the presence of good arouses the desire of good in that thing; but the presence of evil, which makes a thing evil, takes away the desire and friendship of the good; for that which was once both good and evil has now become evil only, and the good has no friendship with evil."

"It is impossible to improve the world if first the man does not improve."

"Let parents bequeath to their children not riches, but the spirit of reverence."

"Wisdom alone is the true and unalloyed coin for which we ought to exchange all things, for this and with this everything is bought and sold Fortitude, temperance, and justice; in a word, true virtue subsists with wisdom."

"We shall be better and braver and less helpless if we think that we ought to enquire, than we should have been if we indulged in the idle fancy that there was no knowing and no use in seeking to know what we do not know;— that is a theme upon which I am ready to fight, in word and deed, to the utmost of my power."