Ad Diem Illum Laetissimum §8

⁸ Hence it follows, as We have already pointed out, that the Virgin is more powerful than all others as a means for uniting mankind with Christ. Hence too since, according to Christ Himself, "Now this is eternal life: That they may know thee the only truly God, and Jesus Christ whom thou hast sent" ( John xvii., 3), and since it is through Mary that we attain to the knowledge of Christ, through Mary also we most easily obtain that life of which Christ is the source and origin.