This is what I believe

Happiness will keep you behave sweetly. Challenge will keep you strong. Sorrow will keep you human. Failure will keep you modest. Success will keep you passionate, but only your attitude and loyalty which will keep you moving forward.

Quoted from: http://www.bestinspirationalquotes4u.com/blog/37/life-that-can-be-explained-in-one-sentence/
Picture by Marcus Bell