Wherefore. The Lord teaches how to avoid this sin of giving offence, repeating the solemn words already delivered in the sermon on the mount, though with some variation and a different context (Matthew 5:29, Matthew 5:30).
The reference on the former occasion was especially to breaches of the seventh commandment; here the Lord speaks of offences in general, of that external corruption among mankind which is the fruitful source of temptation and sin.
The only remedy for this is the sternest self-denial, the strictest watchfulness. Or thy foot. Christ did not name this member in his previous discourse. Literally, the hand or foot leads into sin, when it is directed to forbidden objects, moves towards the acquisition of things contrary to the Law of God.
Metaphorically, the expression signifies all that is as dear and as necessary as these important members. Such occasions of sin we must at once and absolutely cast aside. It includes also persons as well as things.
Friends the dearest must be parted from if their presence, or conversation, or habits cause evil thoughts or encourage evil acts. In the presence of such offences, ties the nearest must be snapped asunder.
Loneliness, isolation, is better than companionship in wickedness. It has been well said by Olshausen that the hand and the foot may denote mental powers and dispositions; and the warning is given that their over-cultivation may prove an obstacle to the spiritual life, and must be accordingly checked.
We may also descry in the paragraph an admonition against making too much of skill, dexterity, and adroitness in business and occupation. There is a subtle snare in them; they may draw the heart away from God, and must be restrained and modified, so as not to interfere with the cultivation of religion and the care of the soul.
Enter into life. This is an addition not found in the sermon on the mount; it refers to the eternal life which, beginning on earth, is consummated in heaven. Everlasting fire ( το Ì πῦρ το Ì αἰω ìνιον).
This is the first time that this phrase occurs. Whatever these words may mean, there can be no doubt that they signify, and are intended to signify, some awful kind and extent of punishment, the fear of which may deter from such sins as incur it.
It is not morally expedient to minimize the force of such terms by disputing about the exact connotation of "aeonian." When we remember that the words are spoken by the loving and pitiful Saviour, we must allow that they point to some dreadful reality, the import of which he knew, and which he thus mercifully veiled from us as not able to bear the full revelation (see on Matthew 25:46).