The important thing, Jesus is saying (in Matthew 5:33-37), is to tell the truth and keep one's pledges without insisting that a certain form of words must be used if it is to be binding. No oath is necessary for the truthful person... Their word is so reliable that nothing more than a statement is needed from them.
D. A. CarsonWorship is the proper response of all moral, sentient beings to God, ascribing all honor and worth to their Creator-God precisely because he is worthy, delightfully so.
D. A. CarsonIt was not nails that held Jesus to that wretched cross; it was his unqualified resolution, out of love for his Father, to do his Father's will-and it was his love for sinners like me.
D. A. CarsonSome Christians want enough of Christ to be identified with him but not enough to be seriously inconvenienced; they genuinely cling to basic Christian orthodoxy but do not want to engage in serious Bible study; they value moral probity, especially of the public sort, but do not engage in war against inner corruptions; they fret over the quality of the preacher's sermon but do not worry much over the quality of their own prayer life. Such Christians are content with mediocrity.
D. A. Carson