What need is there to say more? The childish work for their own benefit, The Buddhas work for the benefit of others. Just look at the difference between them.
ShantidevaIf the problem can be solved why worry? If the problem cannot be solved worrying will do you no good.
ShantidevaPassion is overcome only by him who has won through stillness of spirit the perfect vision; it comes through the contentment that is regardless of the world.
Shantideva