! John 3:9 is NOT an apparent verse. It is the word of God.
When anyone is saved he has been given eternal life at the moment of conversion. However, only in his soul has he been saved, hence in his soul existence, which is born from above, he does not sin or cannot sin.
On the other hand, his body has not been saved as yet until the last day when it is resurrected. In the meantime, while he lives the rest of his life on earth, he will continue to sin as his body is still unsaved. Paul cried, “O wretched man that I am who will save me from the Body of this death?” SEE Romans 7:15-25.
To God Be The Glory