The ultimate authority must always rest with the individual's own reason and critical analysis.

The use of travelling is to regulate imagination by reality, and instead of thinking how things may be, to see them as they are.

There is always time to add a word, never to withdraw one.

Reflect upon your present blessings, of which every man has many; not on your past misfortunes, of which all men have some.

Time flies over us, but leaves its shadow behind.

Colorless green ideas sleep furiously

Whatever you think the world is withholding from you, you are withholding from the world.

Anywhere you go in the world is what you make of it, not what you read in books.

Moderation in temper is always a virtue; but moderation in principle is always a vice.

Wise men speak because they have something to say; Fools because they have to say something.

The greatest deception men suffer is from their own opinions.

Desire, ignorance, and inequality—this is the trinity of bondage.

The only way to get the best of an argument is to avoid it.

The impossible could not have happened, therefore the impossible must be possible in spite of appearances.

Property is surely a right of mankind as real as liberty.

In a good bookroom you feel in some mysterious way that you are absorbing the wisdom contained in all the books through your skin, without even opening them.

I have no desire to make windows into mens souls

I've never known any trouble than an hour's reading didn't assuage.

Science is organized knowledge. Wisdom is organized life.

Stubborn and ardent clinging to one's opinion is the best proof of stupidity.

When you learn, teach, when you get, give.