Faith is the mightiest force that man has at his command. It impels human beings to greatness in thought and word and deed.

Profundity of thought belongs to youth, clarity of thought to old age.

Anger will never disappear so long as thoughts of resentment are cherished in the mind.

A thought comes when it will, not when I will.

Sit as little as possible; give no credence to any thought that was not born outdoors while one moved about freely - in which the muscles are not celebrating a feast, too: all prejudices come from the intestines. The sedentary life - as I have said once before - is the real sin against the holy spirit.

Every difference in human concepts should be seen as a reflection of objective contradictions. These objective contradictions are reflected in subjective thought, forming the contradictory movement of concepts, driving the development of thought, and continuously resolving people's ideological problems.