He who sins is of the devil, for the devil has been sinning from the beginning. To this end the Son of God was revealed, that he might destroy the works of the devil.
That's all. He doesn't give you ten commandments, long list of do's and do nots. All He said is to just believe on Jesus and love one another. I'm glad that He reduced it down to just simplicity. I'll never forget it. It's easy to remember to just believe on Him and to love one another. He doesn't lay a long burden and list on me that I have a hard time fulfilling. Just do this, "Believe on Jesus and love each other."