Above all be of single aim; have a legitimate and useful purpose, and devote yourself unreservedly to it.

Only idiots refuse to change their minds.

One of the truest tests of integrity is its blunt refusal to be compromised.

The essence of knowledge is, having it, to apply it; not having it, to confess your ignorance.

Be silent or let thy words be worth more than silence.

He who conquers others is strong; he who conquers himself is mighty.

The secret of life, though, is to fall seven times and to get up eight times.

The trouble with most of us is that we would rather be ruined by praise than saved by criticism.

A person reveals his character by nothing so clearly as the joke he resents.

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

Common sense is in spite of, not as the result of education.

Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.

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

The road of excess leads to the palace of wisdom.

I hear and I forget. I see and I remember. I do and I understand.

Accuracy is the twin brother of honesty; inaccuracy, of dishonesty.

Learn from the mistakes of others. You can never live long enough to make them all yourself.

There is geometry in the humming of the strings. There is music in the spacing of the spheres.

Science is organized knowledge. Wisdom is organized life.

Admiration is the daughter of ignorance.

I have no desire to make windows into mens souls