I'mma save the world so my first son can see
Might find the door but never touch the key

from Soul Khan (Ft. Akie Bermiss) – Wellstone Lyrics on Rap Genius

Meaning

One line is actually separate from the other. I just really want to save the world so my kids can see it. As for the door/key line, that’s about people who have dreams or ambitions that haunt them but cannot attain them.

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