4 Make yourselves then to appear worthy that Christ should be in your midst. For where peace is, there is Christ, for Christ is Peace; and where righteousness is, there is Christ, for Christ is Righteousness. Let Him be in the midst of you, that you may see Him, lest it be said to you also: “There stands One in the midst of you, Whom you see not.” The Jews saw not Him in Whom they believed not; we look upon Him by devotion, and behold Him by faith.
Source: Letters (New Advent)