“Our wretched species is so made that those who walk on the well-trodden path always throw stones at those who are showing a new road.”

Men will always be mad, and those who think they can cure them are the maddest of all.

May God defend me from my friends: I can defend myself from my enemies.

Think for yourself and let others enjoy the privilege of doing so too.

Sensual pleasure passes and vanishes, but the friendship between us, the mutual confidence, the delight of the heart, the enchantment of the soul, these things do not perish and can never be destroyed.

To the living we owe respect, but to the dead we owe only the truth.

Our labour preserves us from three great evils – weariness, vice, and want.

It is with books as with men: a very small number play a great part.

Doctors put drugs of which they know little into bodies of which they know less for diseases of which they know nothing at all.

The only way to comprehend what mathematicians mean by Infinity is to contemplate the extent of human stupidity.

Love is a canvas furnished by Nature and embroidered by imagination.

There are truths which are not for all men, nor for all times.

When it is a question of money, everybody is of the same religion.

Opinions have caused more ills than the plague or earthquakes on this little globe of ours.

I have chosen to be happy because it is good for my health.

Doubt is an uncomfortable condition, but certainty is a ridiculous one.

Appreciation is a wonderful thing. It makes what is excellent in others belong to us as well.