The past is always with us, for it feeds the present.
In mathematics, the art of proposing a question must be held of higher value than solving it.
The only constant in agriculture is change—embrace it.
"A personality is a full congress of orators and pressure groups, of children, demagogues, communists, isolationists, war mongers, mugwumps, grafters, prayer-makers, adventurers and clerks; with each of these in a minority of one."
精神工作导致的疲劳不是因为工作的数量,而是因为工作的质量。