Matthew 5:37

But let your communication--"your word," in ordinary intercourse, be, Yea, yea; Nay, nay--Let a simple Yes and No suffice in affirming the truth or the untruth of anything. (See Jam 5:12; Co2 1:17-18). for whatsoever is more than these cometh of evil--not "of the evil one"; though an equally correct rendering of the words, and one which some expositors prefer. It is true that all evil in our world is originally of the devil, that it forms a kingdom at the head of which he sits, and that, in every manifestation of it he has an active part. But any reference to this here seems unnatural, and the allusion to this passage in the Epistle of James (Jam 5:12) seems to show that this is not the sense of it: "Let your yea be yea; and your nay, nay; lest ye fall into condemnation." The untruthfulness of our corrupt nature shows itself not only in the tendency to deviate from the strict truth, but in the disposition to suspect others of doing the same; and as this is not diminished, but rather aggravated, by the habit of confirming what we say by an oath, we thus run the risk of having all reverence for God's holy name, and even for strict truth, destroyed in our hearts, and so "fall into condemnation." The practice of going beyond Yes and No in affirmations and denials--as if our word for it were not enough, and we expected others to question it--springs from that vicious root of untruthfulness which is only aggravated by the very effort to clear ourselves of the suspicion of it. And just as swearing to the truth of what we say begets the disposition it is designed to remove, so the love and reign of truth in the breasts of Christ's disciples reveals itself so plainly even to those who themselves cannot be trusted, that their simple Yes and No come soon to be more relied on than…

This chapter, and the two that follow it, are a sermon; a famous sermon; the sermon upon the mount. It is the longest and fullest continued discourse of our Saviour that we have upon record in all the gospels. It is a practical discourse; there is not much of the credenda of Christianity in it - the things to be believed, but it is wholly taken up with the agenda - the things to be done; these Christ began with in his preaching; for if any man will do his will, he shall know of the doctrine, whether it be of God. The circumstances of the sermon being accounted for (Mat 5:1, Mat 5:2), the sermon itself follows, the scope of which is, not to fill our heads with notions, but to guide and regulate our practice. I. He proposes blessedness as the end, and gives us the character of those who are entitled to blessedness (very different from the sentiments of a vain world), in eight beatitudes, which may justly be called paradoxes (Mat 5:3-12). II. He prescribes duty as the way, and gives us standing rules of that duty. He directs his disciples, 1. To understand what they are - the salt of the earth, and the lights of the world (Mat 5:13-16). 2. To understand what they have to do - they are to be governed by the moral law. Here is, (1.) A general ratification of the law, and a recommendation of it to us, as our rule (Mat 5:17-20). (2.) A particular rectification of divers mistakes; or, rather, a reformation of divers wilful, gross corruptions, which the scribes and Pharisees had introduced in their exposition of the law; and an authentic explication of divers branches which most needed to be explained and vindicated (Mat 5:20). Particularly, here is an explication, [1.] Of the sixth commandment, which forbids murder (Mat 5:21-26). [2.] Of the seventh commandment, against adulter…