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

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

Meaning

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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