"God, who gave our forefathers many different glimpses of the truth in the words of the prophets, has now, at the end of the present age, given us the truth in the Son. Through the Son God made the whole universe, and to the Son he has ordained that all creation shall ultimately belong. This Son, radiance of the glory of God, flawless expression of the nature of God, himself the upholding principle of all that is, effected in person the reconciliation between God and man and then took his seat at the right hand of the majesty on high..." Hebrews 1:1-3
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"The new relationship between God and man which Jesus brought is summed up in the word Father. That is to say, the new relationship is based on love and not on law. In such a relationship God is no longer thought of as the judge who must condemn; he is thought of as the Father who cannot be happy until the family circle of his children is complete.
"But the almost necessary reaction to any such message is that it is too good to be true. How can I believe that? What possible guarantee have I that that is true? The guarantor of the new relationship is Jesus. He did not come only to tell in words that this is the case; he came in his own person to demonstrate that this is the case. ‘He who has seen me,’ he said, ‘has seen the Father’ (John 14.9). ‘The word became flesh’ (John 1:14), or, as we might paraphrase it: ‘The mind of God became a person.’ Jesus is the exact demonstration of what God is like, of the mind of God, of the attitude of God to man. In Jesus we see one who fed the hungry, healed the sick, comforted the sorrowing, was the friend of outcasts and sinners. And, because Jesus is one with God, he is the guarantee that God is like that. To put it at its very simplest, Jesus is the guarantor of the love of God. It is through him and him alone that we know what God is like; he lived and he died to show us the heart of God; he is the guarantor of the possibility of the new relationship with God, the relationship in which the old fear has become the new love."
William Barclay, Jesus As They Saw Him