There is a direct relationship between joy and effort. The joy of success is in ratio to the amount of effort expended to achieve it
Contentment is for cows; a challenging purpose is for people.
Your attitude is a choice you make.
Happy people plan actions, they don't plan results.
Losers live in the past. Winners learn from the past and enjoy working in the present toward the future.
The greatest limitations you will ever face will be those you place on yourself.