1 Corinthians 2:10

Irenaeus Against Heresies Book II

For although the Spirit of the Saviour that is in Him "searcheth all things, even the deep things of God,"[242]

Clement of Alexandria Stromata Book II

For it is not spurious words which those inspired by God and those who are gained over by them adduce, nor is it snares in which the most of the sophists entangle the young, spending their time on nought true. But those who possess the Holy Spirit "search the deep things of God,"[16]

Clement of Alexandria Stromata Book VI "For the Spirit searches the deep things of God. But the natural man receiveth not the things of the Spirit."[312]

Origen de Principiis Book I

the same also is said by the apostle of the Holy Spirit, when He declares, "God hath revealed them to us by His Holy Spirit; for the Spirit searcheth all things, even the deep things of God; "[71]

Origen Commentary on Matthew Book XIV

But as we have not yet received the competent mind which is able to be blended with the mind of Christ, and which is capable of attaining to things so great, and which is able with the Spirit to "search all things, even the deep things of God,"[79]