The devil has put a penalty on all things we enjoy in life. Either we suffer in our health, or we suffer in our soul, or we get fat.

It has often been said, and certainly not without justification, that the man of science is a poor philosopher.

Man's will, sustained by an indominable conviction, is much more powerful than material forces that seem insurmountable.

It is the duty of every citizen according to his best capacities to give validity to his convictions in political affairs.

Only one who devotes himself to a cause with his whole strength and soul can be a true master. For this reason mastery demands all of a person.

I cannot seriously believe in it [quantum theory] because the theory cannot be reconciled with the idea that physics should represent a reality in time and space, free from spooky actions at a distance [spukhafte Fernwirkungen].

It is my view that the vegetarian manner of living, by its purely physical effect on the human temperament, would most beneficially influence the lot of mankind.