Samuel Johnson (1798). “Dr. Johnson's Table Talk: Containing Aphorisms on Literature, Life, and Manners; with Anecdotes of Distinguished Persons, Selected and Arranged from Dr. Boswell's Life of Johnson”, p.91
Oldiees Publishing, James Allen (2015). “The Book of Inspiration: As a Man Thinketh - AUDIO EDITION OF SELF IMPROVEMENT IDEAS & INSPIRATIONAL QUOTES FOR PERSONAL DEVELOPMENT”, p.16, Oldiees Publishing