A person who never made a mistake never tried anything new.
Adversity introduces a man to himself.
It's not that I'm so smart, it's just that I stay with problems longer.
Intellectual growth should commence at birth and cease only at death.
I think and think for months and years. Ninety-nine times, the conclusion is false. The hundredth time I am right.
Success comes from curiosity, concentration, perseverance and self criticism.
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.
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