I am overwhelmed by an irresistible temptation to do my climb by moonlight and unroped. This is contrary to all my rock climbing teaching & does not mean poor training, but only a strong-headedness.
Memo to himself in 1947, regarding work on the transistor, as quoted in Broken Genius : The Rise and Fall of William Shockley, Creator of the Electronic Age (2006) by Joel N. Shurkin, Ch. 7, p. 125.