The Inseparable Commands

John goes on to speak of the two things which are well-pleasing in God's sight, the two commandments on obedience to which our relationship to God depends.

(i) We must believe in the name of his Son Jesus Christ. Here we have that use of the word name which is peculiar to the biblical writers. It does not mean simply the name by which a person is called; it means the whole nature and character of that person as far as it is known to us. The Psalmist writes: "Our help is in the name of the Lord" ( Psalms 124:8 ). Clearly that does not mean that our help lies in the fact that God is called Jehovah; it means that our help is in the love and mercy and power which have been revealed to us as the nature and character of God. So, then, to believe in the name of Jesus Christ, means to believe in the nature and character of Jesus Christ. It means to believe that he is the Son of God, that he does stand in relation to God in a way in which no other person in the universe ever stood or ever can stand, that he can perfectly reveal God to men and that he is the Saviour of our souls. To believe in the name of Jesus Christ is to accept him for what he really is.

(ii) We must love one another, even as he gave us his commandment. This commandment is in John 13:34 . We must love each other with that same selfless, sacrificial, forgiving love with which Jesus Christ loved us.

When we put these two commandments together, we find the great truth that the Christian life depends on right belief and right conduct combined. We cannot have the one without the other. There can be no such thing as a Christian theology without a Christian ethic; and equally there can be no such thing as a Christian ethic without a Christian theology. Our belief is not real belief unless it issues in action; and our action has neither sanction nor dynamic unless it is based on belief.

We cannot begin the Christian life until we accept Jesus Christ for what he is; and we have not accepted him in any real sense of the term until our attitude to men is the same as his own attitude of love.

-Barclay's Daily Study Bible (NT)