The Shoemaker’s Children

Doctors clearly do not follow the advice they give to others, and they also have a high proportion of drug addicts. Lawyers often do not leave decent wills when they die. Almost all professionals are slow to use their own expertise for their own work. The situation is nicely summarized by the old saying, “The shoemaker’s children go without shoes.” Consider how in the future, when you are a great expert, you will avoid this typical error!

The Art of Doing Science and Engineering, by Richard W. Hamming