Poetry must always have a moral purpose; it should instruct while it delights.

The true teacher defends his pupils against his own personal influence.

Humans should learn from nature.

The discovery of the genetic code has provided a foundation for understanding heredity and the molecular mechanisms of disease.

有人告诉我在我书中每个方程式将会降低一半的销售量。结果，我确实放了一个方程式——爱因斯坦著名的等式，E=mc2。我发现这并没有吓跑我一半的潜在读者。