" Oh, Danny has quite a reputation for headstrongery.” “Eh? Headstrongery?” said Mr. Pippit. “What kind of a word is that?” “Kind of nice, isn’t it?” Joe said, proudly. “I just invented it. I also invented a motto for him: ‘Leap before you look.’ My own motto is, ‘Sleep before you look. "

― Jay Williams , Danny Dunn and the Heat Ray (Danny Dunn #7)