Nature, when left to universal laws, tends to produce regularity out of chaos.

Reason can never prove the existence of God.

I assert that, in any particular natural science, one encounters genuine scientific substance only to the extent that mathematics is present.

Intuition and concepts constitute... the elements of all our knowledge, so that neither concepts without an intuition in some way corresponding to them, nor intuition without concepts, can yield knowledge.

Through laziness and cowardice a large part of mankind, even after nature has freed them from alien guidance, gladly remain immature. It is because of laziness and cowardice that it is so easy for others to usurp the role of guardians. It is so comfortable to be a minor!

Life is the faculty of spontaneous activity, the awareness that we have powers.

All our knowledge begins with the senses...