4 He that saith , I know him, and keepeth not his commandments, is a liar, and the truth is not in him.
WEll, here you have it.
If you claim to LOVE HIM and do not keep HIS commandments, the WORD of GOD says you are a LIAR and the WORD (Jesus IS the WORD) and the truth (Jesus is the TRUTH and the LIFE) is not in you!
That is pretty straightforward.....