St. John Chrysostom really hits the nail on the head with this quote. Notice how he accents the powerful working of the means of grace — they’re all God’s doing, not ours. Note, too, how he can take a comment by the evangelist Matthew about the crowds of sick people touching His garment, and apply it fruitfully to the Holy Supper, where we receive not the hem of His garment, but the Lord Jesus Himself. He goes on to mention baptism as well. A moving and doctrinally rich quote.
Let us also then touch the hem of His garment, or rather, if we be willing, we have Him entire. For indeed His body is set before us now, not His garment only, but even His body; not for us to touch it only, but also to eat, and be filled. Let us now then draw near with faith, every one that hath an infirmity. For if they that touched the hem of His garment drew from Him so much virtue, how much more they that possess Him entire? Now to draw near with faith is not only to receive the offering, but also with a pure heart to touch it; to be so minded, as approaching Christ Himself. For what, if thou hear no voice? Yet thou seest Him laid out; or rather thou dost also hear His voice, while He is speaking by the evangelists.
Believe, therefore, that even now it is that supper, at which He Himself sat down. For this is in no respect different from that. For neither doth man make this and Himself the other; but both this and that is His own work. When therefore thou seest the priest delivering it unto thee, account not that it is the priest that doeth so, but that it is Christ’s hand that is stretched out.
Even as when he baptizes, not he doth baptize thee, but it is God that possesses thy head with invisible power, and neither angel nor archangel nor any other dare draw nigh and touch thee; even so now also. For when God begets, the gift is His only.
— St. John Chrysostom, Homily L