X. (9) Their notion that the children of promise are conceived by the Holy Ghost is utterly unscriptural and uncatholic.
The ninth notice declares that they say the sons of promise are born indeed of women but conceived by the Holy Spirit: lest that offspring which is born of carnal seed should seem to share in God's estate. This is repugnant and contrary to the Catholic Faith which acknowledges every man to be formed by the Maker of the Universe in the substance of his body and soul, and to receive the breath of life within his mother's womb: though that taint of sin and liability to die remains which passed from the first parent into his descendants; until the sacrament of Regeneration comes to succour him, whereby through the Holy Spirit we are re-born the sons of promise, not in the fleshly womb, but in the power of baptism. Whence David also, who certainly was a son of promise, says to God: “Your hands have made me and fashioned me.” And to Jeremiah says the Lord, “Before I formed you in the womb I knew you, and in your mother's belly I sanctified you.”
Source: Letters (New Advent)