My own beauty reflected The lake was silent for some time. Finally, it said: "I weep for Narcissus, but I never noticed that Narcissus was beautiful. I weep because, each time he knelt beside my banks, I could see, in the depths of his eyes, my own beauty reflected." Paulo Coelho, The Alchemist Narcissus and Goldmund beautyego
Using your own expertise 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.” Richard Hamming, The Art of Doing Science and Engineering: Learning to Learn The cobbler's children go barefoot