That part of me left yesterday
The heart of me is strong today

from T.I. (Ft. Justin Timberlake) – Dead and Gone Lyrics 1 on Rap Genius

He used to be weaker, now he is stronger as time goes by. He learns more and becomes stronger from each experience so it’s like he experiences a “rebirth” or like a phoenix rising from out of the ashes.

For example:

Old Flash

Reborn or New Flash

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