Manuel

“Epictetus, who said, “It's not events, but our opinions about them, which cause us suffering.”
― Daniel Coyle, The Talent Code: Unlocking the Secret of Skill in Sports, Art, Music, Math, and Just About Everything Else

“As to methods there may be a million and then some, but principles are few. The man who grasps principles can successfully select his own methods. The man who tries methods, ignoring principles, is sure to have trouble.”
― Harrington Emerson