Past and present I find in all movement of things; but it is not so in the Truth that remains forever; I only find the present in her, and this is incorruptible; this cannot be said of creatures.
(In Io. Ev. XXXVIII, 10)
The absence of the Lord is not an absence. Just believe, and the one who you do not see is with you.
When did the Lord want to show himself? At the breaking of the bread. We can be sure of that: by sharing the bread, we recognize the Lord.