By this shall all men know that you are my disciples, if you have love one to another.
Love is —
I. A SIMPLE TEST. Had it been the adoption of a certain set of beliefs, or conformity to certain rites, it would have been too complicated to be of easy application or practical use; but here how simple — "He that loveth not his brother whom he hath seen," etc.
II. AN INFALLIBLE TEST. Other tests, even the best, are of doubtful accuracy; the application may lead to wrong conclusions. But this is infallible, and will determine the destiny of all men at the last day (Matthew 25).
III. A SOLEMN TEST. If we apply it to the Christians of this age and country, where men hate, cheat, and fight each other, how few will prove genuine disciples l Could all men stand it the world would be a paradise.
(D. Thomas, D. D.)
Parallel VersesKJV: By this shall all men know that ye are my disciples, if ye have love one to another.