I give my opinion not as being good, but as being my own.

The world is but a perennial movement. All things in it are in constant motion-the earth, the rocks of the Caucasus, the pyramids of Egypt-both with the common motion and with their own.

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.

Virtue shuns ease as a companion. It demands a rough and thorny path.

The most evident token and apparent sign of true wisdom is a constant and unconstrained rejoicing.

Habit is second nature.

I turn my gaze inward. I fix it there and keep it busy. I look inside myself. I continually observe myself.