Shared ground
Jesus contrasts two things: Moses’ permission for divorce and God’s intention “from the beginning” (v. 8). The permission is presented as a concession to human hard-heartedness, not the original pattern.
Jesus also treats divorce and remarriage as morally weighty, describing remarriage after divorce as adultery, while including an exception linked to “sexual immorality” (v. 9). The disciples hear his statement as making marriage unusually demanding (v. 10).
Jesus then clarifies that this “saying” is not equally workable for everyone; some can “receive” it and some cannot (v. 11). He uses to illustrate that some people are unmarried due to circumstances and some remain unmarried by choice “for the Kingdom of Heaven’s sake” (v. 12).
Where interpretation differs
1) What the exception (“except for sexual immorality”) permits. Some read v. 9 as saying sexual immorality makes divorce—and the remarriage that follows—no longer count as adultery. Others think the exception is narrower: it covers a specific kind of sexual wrongdoing that means the “marriage” was never a valid marriage in the first place, or it addresses a particular situation that doesn’t generalize to all cases.
2) Who “he who marries her when she is put away” refers to. Some take it broadly: any man who marries a divorced woman commits adultery because the first bond still stands. Others think the “her” points to a woman wrongly divorced (without the v. 9 exception), so the adultery charge is tied to an unjust divorce rather than every possible divorce scenario.
3) What “made themselves eunuchs” means. Many understand it as a figure for voluntarily remaining unmarried and sexually abstinent for kingdom-focused reasons. A minority reading in church history has treated it as a literal bodily action, but the flow of vv. 10–12 strongly favors an explanation about singleness rather than self-harm.
Why the disagreement exists
The disagreements mainly come from how tightly to connect v. 9’s exception clause to the rest of the adultery statement, and how to map Jesus’ short, scenario-based wording onto the variety of real-life divorce situations. Also, the eunuch analogy can be heard either as literal description, metaphor, or both; the immediate context (a discussion about whether it is “better not to marry”) pushes interpretation toward singleness.
What this passage clearly contributes
Explicitly, the passage claims: Moses’ divorce allowance was a concession to hard-heartedness; it did not reflect the creation intention (v. 8). Jesus frames divorce-plus-remarriage as adultery in general terms, while adding a sexual-immorality exception (v. 9). He acknowledges that the disciples’ reaction is understandable and then introduces an important category: not everyone has the same capacity to live out the “saying” being discussed (v. 11). Finally, he legitimizes singleness as a real condition (by circumstance or choice) and presents voluntary singleness “for the Kingdom of Heaven’s sake” as an intelligible path for some (v. 12).