Although I cannot believe that the individual survives the death of his body, feeble souls harbor such thought through fear or ridiculous egotism.

Science is a wonderful thing if one does not have to earn one's living at it.

The school has always been the most important means of transferring the wealth of tradition from one generation to the next. This applies today in an even higher degree than in former times, for through modern development of economic life, the family

I never think of the future. It comes soon enough. When visiting the U.S. from Germany for a winter academic stay.

God did not create evil. Just as darkness is the absence of light, evil is the absence of God.

The longing to behold this pre-established harmony [of phenomena and theoretical principles] is the source of the inexhaustible patience and perseverance with which Planck has devoted himself ... The state of mind which enables a man to do work of this kind is akin to that of the religious worshiper or the lover; the daily effort comes from no deliberate intention or program, but straight from the heart.

A happy man is too satisfied with the present to dwell too much on the future.