其言一也，言者异，则人心变矣。
解释：说同样的话，由于说话的人不同，人们心中的看法也会随之改变。
Psychology must be independent of philosophy and physiology.
Success is falling nine times and getting up ten.
"A personality is a full Congress of orators and pressure-groups, of children, demagogues, communists, isolationists, war-mongers, mugwumps, grafters, prayer-meetings, spiritualists, and astrologers."
The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as in poetry.