The fundamental job of a kid is to be selfish—to pursue their own needs and desires—and the fundamental job of a parent is to be selfless.

The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function.

物理理论的美不仅在于其数学的优雅，还在于其解释和预测现象的能力。

死者并非无力。死亡，并非无力。

Humans should learn from nature.