If only I could hear your voice, and your laughter
Just one more time, my chest would be filled up with sunshine

from Nas – Dance Lyrics on Rap Genius

Nas is describing how happy he would feel just to be with his mother and hear her one more time. He uses the brightness of sunshine to explain how happy and invigorated he would be.

By contrast, you can understand how sad and lonely he must currently feel without her presence

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