Freedom of teaching and of opinion in book or press is the foundation for the sound and natural development of any people.

External conditions can, to a certain extent, reduce, but never cancel individual repsonsibility.

The Devil craps on the big pile

Out yonder there was this huge world...which stands before us like a great eternal riddle.

No idea is conceived in our mind independent of our five senses [i.e., no idea is divinely inspired].

The word 'God' is for me nothing more than the expression and product of human weaknesses, and religious scripture a collection of honourable, but still primitive legends which are nevertheless pretty childish. No interpretation, no matter how subtle, can (for me) change this.

Overemphasis of the competitive system and premature specialization on the ground of immediate usefulness kill the spirit on which all cultural life depends, specialized knowledge included.