The tragedy of life is in what dies inside a man while he lives - the death of genuine feeling, the death of inspired response, the awareness that makes it possible to feel the pain or the glory of other men in yourself.
The feeling that someone owes us something, the pain for the harm that others caused us, etc., stops the inner progress of the soul.
Feeling is the secret.
Some age. Others mature.
Pain is inevitable. Suffering is optional.