Success comes from curiosity, concentration, perseverance and self criticism.
Adversity introduces a man to himself.
I think and think for months and years. Ninety-nine times, the conclusion is false. The hundredth time I am right.
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.
