Mark 10:9

But if two persons, whom God has joined together, are not to be separated; much more is it wrong to separate from Christ, the Church, which God has joined to Him.

(ubi sup.) What therefore God hath conjoined by making one flesh of a man and a woman, that man cannot separate, but God alone. Man separates, when we dismiss the first wife because we desire a second; but it is God who separates, when by common consent, for the sake of serving God, we so have wives as though we had none.

What therefore God has joined together, let not man separate. What God has joined, making one flesh out of man and woman, man cannot separate, except perhaps God alone. Man separates when, due to the desire for a second wife, he dismisses the first. God …

What therefore God hath joined together,.... See Gill on Mat 19:6.

The opening verse of this passage shows us the patient perseverance of our Lord Jesus Christ as a teacher . We are told that "Jesus then left that place and went into the region of Judea and across the Jordan. Again crowds of people came to him, and as was his custom, he taught them." Wherever our Lord went, He was always about His Father's business, preaching, teaching, and laboring to do good to souls. He threw away no opportunity. In the whole history of His earthly ministry, we never read of an idle day. Of Him it may be truly said, that He "sowed beside all waters," and that "in the morning He sowed his seed, and in the evening withheld not His hand." (Isaiah 32:20. Eccles. 11:6.) And yet our Lord knew the hearts of all men. He knew perfectly well that the great proportion of His hearers were hardened and unbelieving. He knew, as He spoke, that most of His words fell to the ground uncared for and unheeded, and that so far as concerned the salvation of souls, most of His labor was in vain. He knew all this, and yet He labored on. Let us see in this fact a standing pattern to all who try to do good to others, whatever their office may be. Let it be remembered by every minister and every missionary — by every schoolmaster and every Sunday-school teacher — by every district visitor and every lay agent — by every head of a house who has family prayers — and by every caretaker who has the charge of children. Let all such remember Christ's example, and resolve to do likewise. We are not to give up teaching, because we see no good done. We are not to relax our exertions, because we see no fruit of our toil. We are to work on steadily, keeping before us the great principle, that duty is ours, and results are God's. There must be ploughmen and sowers as well as reapers and binders of sheaves.