The past is always with us, for it feeds the present.

信任是合作的货币，必须每天努力赢得。

In mathematics, the art of proposing a question must be held of higher value than solving it.

人类是一个太阳；感官是他的行星。

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。