A man who is too successful is not a real human. Too much success taints your soul.
If you are too successful and don't experience failure, you become unable to understand failure.
How it happens, is beyond you.
You lose empathy, and dehumanize those who didn't succeed, because you did. 
A man too successful lacks empathy as a result.

A true successful man had hardship, hardship that allows him to empathize, failures he learnt from.