Billy Joe Shaver wrote and recorded this song. I don't how many people in general can identify with these lyrics from the standpoint of self-improvement - I hope all can.
However, I can attest to the fact that all Christians can identiy with the lyrics.
Self-improvement is of God. Actually, He has empowered us to be like Him. But our struggle is with ourselves. Having the power to manifest as a Son of God is not the same as actually manifesting as one.
So, for all those who aspire to self-improvement, commit to it, see yourself as the new man, then moment by moment just be it.