The Knowledge Of The Father And The Son

De die autem illa et hora nemo scit neque angeli in coelo, neque Filius, nisi Pater solus. Sed quaerendum est quare ille dicat Filium nescire ista, et solum Patrem scire, cum ipse dicat: Omnia tradita sunt a Patre meo, et item: Omnia quae habet Pater mea sunt, et illud: Ego et Pater unum sumus. Si enim ipse et Pater unum sunt, quomodo nescit Filius quod scit Pater? Sed ut locus iste sobrie intelligatur videndum est quod sit scire, vel quod nescire. Scire Dei est approbare, unde ait Moysi: Novi te ex nomine, id est approbavit. Aliter scire Dei est alios scientes facere, unde Moyses dixit filiis Israel: Tentat vos Dominus Deus vester ut sciat si diligitis eum, quod non ita accipiendum est quasi ait aliquid quod Deus nesciat; sed sciat dicit, id est scire vos faciat quantum in ejus dilectione profeceritis, quod aliter cognosci non poterat, nisi tentationibus probaretur. Si ergo scire Dei est approbare, nescire illius reprobare est, unde in fine saeculi dicturus est impiis: Nescio vos, id est in doctrina et disciplina mea non vos invenio, non vos approbo. Rursus si scire Dei est alios scientes facere, nescire illius est alios utiliter nescientes facere. Et ideo beatus Marcus dicit Filium nescire, quia ipse utiliter facit alios nescire diem judicii, quod non prodest illis scire; si enim homo diem judicii, vel diem mortis cognosceret, aliud tempus deputaret volupataibus, et aliud poenitentiae; voluit quippe Dominus diem judicii omnibus esse occultum, quatenus semper sit suspectus; voluit esse ignotum, ut omnes sint parati et pervigiles. Remigius Antissiodorensis, Homilia I Source: Migne PL 131.870b-d

Regarding that day and hour no one knows, not the angels in heaven, nor the Son, but the Father only. 1 But it must be asked why He says the the Son does not know this and the Father alone knows, when He says: 'Everything has been given to me by the Father,' and 'Everything which the Father has is mine,' and 'The Father and I are one.' 2 For if He and the Father are one, how does the Son not know what the Father knows? But that this line may be understood correctly it is necessary to look into what 'to know' and  what 'not to know' means. God's knowing is approval, whence He says to Moses 'I know you by name,' 3 that is, I approve of you. Along with this God's knowing is to make others know, whence Moses said to the sons of Israel: 'The Lord your God is testing you that He might know if you love Him.' 4 Which must not be understood as if he speaks of something that God does not understand, but saying 'He might know' is a making you know how much you have advanced in the love of Him, which otherwise would not be known, for such a thing is proved by trials. If then God's knowing is approval, His not knowing is reproval, whence at the end of the world it is said to the wicked: 'I do not know you,' 5 that is, 'I do not find you in my teaching and discipline. I do not approve of you.' Again if God's knowing is to make others know, His not knowing is the useful making of the not knowing of others. And therefore the blessed Mark says the Son does not know, because He usefully makes others not know the day of judgement, for that would be of no benefit to them. If a man knew the day of judgement or the day of his death, he could give a part of his time to indulgence, and another part to penitence. But since the Lord wishes that the day of judgement should be hidden to all, to that extent it must always be expected. Thus He wished it to be unknown so that everyone would be prepared and watchful. Remigius of Auxerre, from Homily 1 1 Mt 24.36 2 Mt 11.27, Lk 10.22, Jn 16.15, Jn 10.30 3 Exod 33.12 4 Deut 13.3 5 Mt 25.12, Lk 13.25