Pope Shenouda III
Withdraw as much as you can to devote yourself to God. However, if, despite your efforts, time becomes limited, devotion takes on another meaning:
At least, aim to devote the fast for the Lord.
In this way, it becomes a sacred fast, for it is consecrated to God as far as its aim and approach are concerned. In this we comprehend the dual meaning of the word sacred namely pure for it is to the Lord.