Pain is inevitable, but misery is optional.
Tim Hansel
When you lose, do not lose the lesson
Dalai Lama
Nature, when she adds difficulties, adds brains.
Emerson
Difficulties strengthen the mind, as well as labor does the body
Seneca
Aromatic plants bestow
No spicy fragrance where they grow;
But crushed and trodden to the ground,
Diffuse their balmy sweets around
Goldsmith
There is healing in the bitter cup.
Southey
All the best things that I did at Apple came from (a) not having money and (b) not having done it before, ever.
Steve Wozniak, Apple