24. And well is it written: “He is the same yesterday and to-day,” so that the impiety of Arius might find no room to pile up its profanity. For he, in reading in the second psalm of the Father saying to the Son, “Thou art My Son, this day have I begotten Thee,” Ps. ii. 7. noted the word “to-day,” not “yesterday,” referring this which was spoken of the assumption of our flesh to the eternity of the divine generation; of which Paul also says in the Acts of the Apostles: “And we declare unto you the promise which was made to our fathers: for God has fulfilled the same to our children, in that He hath raised up the Lord Jesus Christ again, as it is written in the second psalm: Thou art My Son, this day have I begotten Thee.” Acts xiii. 32, 33. Thus the Apostle, filled with the Holy Ghost, in order that he might destroy that fierce madness of his, said: “The same, yesterday, to-day, and for ever.” “Yesterday” on account of His eternity; “to-day” on account of His taking to Himself a human body.