“There is far too great a disproportion between what one is and what others think one is, or at least what they say they think one is.”

“A man should look for what is, and not for what he thinks should be.”

“One should not pursue goals that are easily achieved. One must develop an instinct for what one can just barely achieve through one’s greatest efforts.”

“How strange is the lot of us mortals! Each of us is here for a brief sojourn; for what purpose he knows not, though he senses it. But without deeper reflection one knows from daily life that one exists for other people.”

“The right to search for the truth implies also a duty; one must not conceal any part of what one has recognized to be the truth.”

“I never made one of my discoveries through the process of rational thinking”

“When the number of factors coming into play in a phenomenological complex is too large scientific method in most cases fails. One need only think of the weather, in which case the prediction even for a few days ahead is impossible.”