Steven Weinberg's four golden lessons

http://www.nature.com/nature/journal/v426/n6965/full/426389a.html

1.No one knows everything, and you don't have to.
2.While you are swimming and not sinking you should aim for rough water.
3.Forgive yourself for wasting time.
4.Learn something about the history of science, or at a minimum the history of your own branch of science.

关于最后一个理由，温伯格说：now and then scientists are hampered by believing one of the over-simplified models of science that have been proposed by philosophers from Francis Bacon to Thomas Kuhn and Karl Popper. The best antidote to the philosophy of science is a knowledge of the history of science.