The old commandment that we have had from the beginning is the same as the new commandment. It is all the “word” that we have heard. We have seen it manifest perfectly in the Lord Jesus and seen glimpses of the word, Jesus the Christ,  manifested in the apostles, and sometimes even seen the Lord manifested in us.

Jesus states the old and new commandment that, ” we are to love the Lord our God with all our heart, soul, mind and strength and to love our neighbors as ourselves”. John explains that loving our brothers shows we walk in the light, not loving shows we are in darkness. When we are in darkness we do not know where we are going because darkness has blinded our eyes. When we stay angry with the brethren we are being (choosing to be) blind. We are not seeing the whole picture. The word is not abiding in us and we are being overcome by evil.

I John 2