To have a good idea of God is the truest beginning of piety.
(De libero arbitrio I, 2,5)
If you are the Body of Christ and its members, it is your mystery that is placed on the Lord's table. It is your mystery that you receive. To what you are, you respond «Amen», and by responding, you become part of it.
Because every man is a neighbor to all men, one should not allow any kind of distance where there is a common nature.
(En. in ps. 118, S 8, 2)