Ambrose Bierce
A person who doubts himself is like a man who would enlist in the ranks of his enemies and bear arms against himself. He makes his failure certain by himself being the first person to be convinced of it.
More quotes and aphorisms
You can't teach an old dog...You know, my friends, with what a brave...Women would rather be right than reasonable...Real knowledge is to know the extent of one's ignorance...There are only two kinds of men...All great things are simple...