"If you think you are beaten, you are; If you think you dare not, you don't. If you'd like to win, but think you can't, It's almost a cinch you won't. If you think you'll lose, you're lost, For out in the world we find begins with a fellow's will; It's all in the state of mind. If you think you're outclassed, you are; You've got to think high to rise. You've got to be sure of yourself before You can ever win a prize. Life's battles don't always go To the stronger or faster man; But soon or late the man who wins Is the one who thinks he can."
January 1, 1970
https://en.wikiquote.org/wiki/Optimism