People become really quite remarkable when they start thinking that they can do things. When they believe in themselves they have the first secret of success.

Earlier variant: People become really quite remarkable when they start thinking that they can do things. And those who have learned to have a realistic, nonegotistical belief in themselves, who possess a deep and sound self-confidence, are assets to mankind, too, for they transmit their dynamic quality to those lacking it. | ‪You Can If You Think You Can‬ (1987), p. 84