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John 13:17
If ye know these things, happy are ye if ye do them. (John 13:17)
If ye do them.
 Doing is not to be divorced from professing (see Matt. 7:21; Luke 6:46; 12:47;Rom. 2:13; James 1:25).
Happy.
 Gr. makarioi (see on Matt. 5:3).
If ye know.
 A knowledge of duty places upon man the responsibility of performance. A man is not held responsible for the things of which he is ignorant, provided, of course, that his ignorance is not willful (see John 9:41; 15:22; Rom. 5:13; James 4:17).