Hold a picture of yourself long and steadily enough in your mind's eye and you will be drawn toward it. Picture yourself vividly as defeated and that alone will make victory impossible. Picture yourself vividly as winning, and that alone will contribute immeasurably to success. Do not picture yourself as anything and you will drift like a derelict.
Statement made in 1937 or earlier, as quoted in Personality and Life : A Practical Guide to Personality Improvement (1941) by Jay N. Holliday