Joh 1:14 And the Word became flesh and dwelt among us, and we have seen his glory, glory as of the only Son from the Father, full of grace and truth.
As a Believer, you can bear your testimony that Christ is the only begotten of the Father, as well as the first begotten from the dead. You can say, "He is divine to me, if he be human to all the world beside. He has done that for me which none but a God could do. He has subdued my stubborn will, melted a heart of adamant, opened gates of brass, and snapped bars of iron. He hath turned for me my mourning into laughter, and my desolation into joy; he hath led my captivity captive, and made my heart rejoice with joy unspeakable and full of glory. Let others think as they will of him, to me he must be the only begotten of the Father: blessed be his name. And he is full of grace. Ah! had he not been I should never have been saved. He drew me when I struggled to escape from his grace; and when at last I came all trembling like a condemned culprit to his mercy-seat he said, 'Thy sins which are many are all forgiven thee: be of good cheer.' And he is full of truth. True have his promises been, not one has failed. I bear witness that never servant had such a master as I have; never brother such a kinsman as he has been to me; never spouse such a husband as Christ has been to my soul; never sinner a better Saviour; never mourner a better comforter than Christ hath been to my spirit. I want none beside him. In life he is my life, and in death he shall be the death of death; in poverty Christ is my riches; in sickness he makes my bed; in darkness he is my star, and in brightness he is my sun; he is the manna of the camp in the wilderness, and he shall be the new corn of the host when they come to Canaan. Jesus is to me all grace and no wrath, all truth and no falsehood: and of truth and grace he is full, infinitely full. My soul, this night, bless with all thy might 'the only Begotten.'"