Never do anything against conscience even if the state demands it.

We must recognize what in our accepted tradition is damaging to our fate and dignity-and shape our lives accordingly.

Gradually the conviction gained recognition that all knowledge about things is exclusively a working-over of the raw material furnished by the senses. ... Galileo and Hume first upheld this principle with full clarity and decisiveness.

But the creative principle resides in mathematics. In a certain sense, therefore, I hold true that pure thought can grasp reality, as the ancients dreamed.

Most people see what is, and never see what can be.

Where there is love, there is no imposition.

the contemplation of this world beckoned like a liberation