7 But to be in this way in the form of God is nothing else than to be equal with God: so that equality of honour is owed to the Lord Jesus Christ, Who is in the form of God, as He Himself says, That all men may honour the Son, even as they honour the Father. He that honours not the Son honours not the Father Who sent Him. There is never a difference between things which does not also imply a different degree of honour. The same objects deserve the same reverence; for otherwise the highest honour will be unworthily bestowed on those which are inferior, or with insult to the superior the inferior will be made equal to them in honour. But if the Son, regarded as a creation rather than a birth, be treated with a reverence equal to that paid the Father, then we grant no special meed of honour to the Father, since we charge ourselves with only such reverence towards Him as is shown to a creature. But since He is equal to God the Father, inasmuch as He is born as God from Him, He is also equal to Him in honour, for He is a Son and not a creature.
Source: On the Trinity (New Advent)