Before I formed you in the womb I knew you; and before you came forth out of the womb I sanctified you, and I ordained you a prophet unto the nations.
All Commentaries on Jeremiah 1:5 Go To Jeremiah 1
Ambrose of Milan
AD 397
“The bosom of the Father” is to be understood in a spiritual sense, as a kind of innermost dwelling of the Father’s love and of his nature, in which the Son always dwells. Even so, the Father’s womb is the spiritual womb of an inner sanctuary, from which the Son has proceeded just as from a generative womb.… The Father speaks of that womb through the prophet Jeremiah: “Before I formed you in the womb I knew you, and before you were born I consecrated you.” Therefore, the prophet showed that there was a twofold nature in Christ, the divine and the fleshly, the former from the Father, the latter from a virgin, but in such a way that Christ was not deprived of his divinity when he was born from a virgin and was in the body.