For to which of the angels did God ever say-- 'Thou art my Son; this day I have become thy Father'? or again-- 'I will be to him a Father, and he shall be to me a Son'?
That our children have had this promise completely fulfilled to them by God, by his raising Jesus. That is just what is said in the second Psalm--'Thou art my Son; this day I have become thy Father.'
In the same way, even the Christ did not take the honour of the High Priesthood upon himself, but he was appointed by him who said to him-- 'Thou art my Son; this day I have become thy Father';