It appertaineth to the true God alone to be able to loose men from their sins.

Indeed the mystery of Christ runs the risk of being disbelieved precisely because it is so incredibly wonderful

He who receives Communion is made holy and Divinized in soul and body in the same way that water, set over a fire, becomes boiling... Communion works like yeast that has been mixed into dough so that it leavens the whole mass; ...Just as by melting two candles together you get one piece of wax, so, I think, one who receives the Flesh and Blood of Jesus is fused together with Him by this Communion, and the soul finds that he is in Christ and Christ is in him

It appertaineth to the true God alone to be able to loose men from their sins.

As two pieces of wax fused together make one so he who receives Holy Communion is so united with Christ that Christ is in him and he is in Christ.