Your most important sale in life is to sell yourself to yourself.
Source: In The World's Best Thoughts on Life & Living, compiled by Eugene Raudsepp, 1981.
-- Maxwell Maltz, (Mar 10 1899-1975), US cosmetic surgeon, author; He wrote Psycho-Cybernetics (1960), which was a system of ideas that he claimed could improve one's self-image leading to a more successful and fulfilling life.