30 We therefore expose the blasphemous misunderstanding at which they have arrived by distortion and perversion of the meaning of Christ's words. We account for those words by stating what manner of questions He was answering, at what times He was speaking, what partial knowledge He was deigning to impart; we make the circumstances explain the words, and do not force the former into consistency with the latter. Thus each case of variance, that for instance between The Father is greater than I, and I and the Father are One, or between None is good save One, even God, and He that has seen Me has seen the Father also, or a difference so wide as that between Father, all things that are Mine are Yours, and Yours are Mine, and That they may know You, the only true God, or between I in the Father and the Father in Me, and But of the day and hour knows no one, neither the angels in heaven nor the Son, but the Father only, is explained by a discrimination between gradual revelation and full expression of His nature and power.
Both are utterances of the same Speaker, and an exposition of the real force of each group will show that Christ's true Godhead is no whit impaired because, to form the mystery of the Gospel faith, the birth and Name of Christ were revealed gradually, and under conditions which He chose of occasion and time.
Source: On the Trinity (New Advent)