The human heart is a complex and often contradictory thing.

Every thought serves some biological purpose.

The welfare of the farmer is the welfare of the nation.

If you're not stubborn, you'll give up on experiments too soon. And if you're not flexible, you'll pound your head against the wall and you won't see a different solution to a problem you're trying to solve.

真相总是由两个半真半假的东西组成。