Consciousness serves the organism's need to interact effectively with its world.

Success in life means doing that which is the very best for us, under the conditions in which we are placed.

谁是神智健全的人？我能把他治好。

The true challenge in mathematics is not solving problems, but asking the right questions.

幸福是短暂的。它不会停留。上帝在击打它的风帆。