..a man may live long, yet live very little. Satisfaction in life depends not on the number of your years, but on your will.

The world is but a school of inquisition; it is not who shall enter the ring, but who shall run the best courses.

And one might therefore say of me that in this book I have only made up a bunch of other people's flowers, and that of my own I have only provided the string that ties them together.

Habituation puts to sleep the eye of our judgment.

When Socrates, after being relieved of his irons, felt the relish of the itching that their weight had caused in his legs, he rejoiced to consider the close alliance between pain and pleasure.

When I dance, I dance; when I sleep, I sleep; yes, and when I walk alone in a beautiful orchard, if my thoughts drift to far-off matters for some part of the time for some other part I lead them back again to the walk, the orchard, to the sweetness of this solitude, to myself.

I study myself more than any other subject. That is my metaphysics, that is my physics.