“Some men learn all they know from books; others from life; both kinds are narrow. The first are all theory; the second are all practice. It’s the fellow who knows enough about practice to test his theories for blow-holes that gives the world a shove ahead.” — George Horace Lorimer, Letters from a Self-Made Merchant to His Son
Source image: https://commons.wikimedia.org/wiki/File:Picture_of_George_Horace_Lorimer.jpg