The Apostle Paul
Romans 8:27ASV·traditional attribution

and he that searcheth the hearts knoweth what is the mind of the Spirit, because he maketh intercession for the saints according to the will of God.

Jamieson-Fausset-Brown Reformed

And--rather, "But," inarticulate though these groanings be. he that searcheth the hearts knoweth what is the mind of the Spirit, because he--the Spirit maketh intercession for the saints according to the will of God--As the Searcher of hearts, He watches the surging emotions of them in prayer, and knows perfectly what the Spirit means by the groanings which He draws forth within us, because that...

Geneva Bible Notes Reformed

And he that searcheth the hearts knoweth what [is] the mind of the Spirit, because he maketh intercession for the saints according to [the will of] God. (i) What sighs and sobs proceed from the impulse of his Spirit. (k) Because he teaches the godly to pray according to God's will.

John Gill Reformed Baptist

And he that searcheth the hearts,.... This is peculiar to God, and a "periphrasis" of him; angels, neither good nor bad, can search into the hearts of men; one man cannot know the heart of another, nor any man fully know his own; this is the prerogative of God: and he knoweth what is the mind of the Spirit; not the spirit of men, but...