Nothing exists in the intellect that has not first gone through the senses.

I don't need a friend who changes when I change and who nods when I nod; my shadow does that much better.

The mind is not a vessel to be filled but a fire to be kindled.

An imbalance between rich and poor is the oldest and most fatal ailment of all republics.

When Demosthenes was asked what was the first part of Oratory, he answered, "Action," and which was the second, he replied, "action," and which was the third, he still answered "Action.

Know how to listen, and you will profit even from those who talk badly.

The real destroyer of the liberties of the people is he who spreads among them bounties, donations and benefits.

Barba non facit philosophum

To make no mistakes is not in the power of man; but from their errors and mistakes the wise and good learn wisdom for the future.

Time is the wisest of all counselors.

No beast is more savage than man when possessed with power answerable to his rage.

An experiment is a question which science poses to Nature and a measurement is the recording of Nature's answer.

The sleep he went back to was never the one he left.

I've always wanted to get an education, and tonight's as good a time as any

It is not the criminal things which are hardest to confess, but the ridiculous and shameful.

I don't consider myself ever joining. But I have affiliations, for sure.

It's better to star in Oshkosh than to starve on Broadway.

An answer is invariably the parent of a whole family of new questions.

If the body is pampered, the mind is free to concentrate.

When I ask you what club to use, look the other way and don't answer.

The birthers, the fanatics, the people running around in right-wing militia and Aryan support groups, it is unbearable to them that President Barack Obama should exist.