The flag is a symbol of the fact that man is still a herd animal.

A person who never made a mistake never tried anything new.

[O]nly if every individual strives for truth can humanity attain a happier future; the atavisms in each of us that stand in the way of a friendlier destiny can only thus be rendered ineffective.

The really valuable method of thought to arrive at a logically coherent system is intuition.

Fantasie is belangrijker dan kennis, want kennis is begrensd.

While it is true that science, to the extent of its grasp of causative connections, may reach important conclusions as to the compatibility and incompatibility of goals and evaluations, the independent and fundamental definitions regarding goals and values remain beyond science's reach.

We [Jews] have no other means of self-defense than our solidarity