THEOSISJohn Chrysostom
It has occurred recently, not in the distant past or merely a moment ago, and you were unaware of it, meaning you neither acknowledged it nor had concern for it.
Isaiah 48:7Meaning & Commentary from the Church Fathers
They are created now, and not of old: and before the day, when thou heardest them not, lest thou shouldst say: Behold I knew them.
עַתָּ֤ה נִבְרְאוּ֙ וְלֹ֣א מֵאָ֔ז וְלִפְנֵי־י֖וֹם וְלֹ֣א שְׁמַעְתָּ֑ם פֶּן־תֹּאמַ֖ר הִנֵּ֥ה יְדַעְתִּֽין׃
The Church Fathers on this verse
3 Church Fathers comment on this verse
Cyrill of Alexandria
Do not claim that you have previously encountered these matters, nor in times long past; for I have announced them since the very beginning. I proclaimed these truths from the outset; indeed, I declared them from the beginning.
Eusebius of Caesarea
The Simmach states that from the moment of your birth you have been labeled as one who turns away from the faith. It is not due to your actions, but because of my human condition, that I prophesied and revealed to you, even at that early stage, what was destined regarding the downfall of your adversaries, striving through all predictions to bring you salvation.