Lest I should be exalted — stated twice, bracketing the thorn. Heaven's privileges carry pride's peril; the thorn was preventive medicine. God may wound a man to save him from something worse than wounds.

There was given — by God; the messenger of Satan — through the enemy. One thorn, two agents: Satan meant to buffet, God meant to keep humble. Job's pattern repeated in an apostle.

Paul prayed for removal three times — earnest, repeated, specific prayer. It was not lack of faith that left the thorn; it was the answer of a wiser Father.

The Lord Jesus also prayed thrice in Gethsemane that the cup might pass — and received, like Paul, not removal but strength. Some prayers are answered with sufficiency instead of deliverance.

The thorn stayed; the grace came — and proved enough. Sufficient is present tense and daily: grace is measured out like manna, always equal to the day's thorn.

My strength is made perfect in weakness — divine power reaches its full display where human power ends. Rest upon me — literally tabernacle over me, as the glory over the tent. Weakness is where the Shekinah settles.

The conclusion goes beyond endurance to pleasure — not masochism, but delight in what weakness procures: the resting power of Christ. Paul has learned to read his limitations as invitations.

When I am weak, then am I strong — the paradox at the heart of the letter and of the Christian life. Self-sufficiency repels grace; admitted emptiness is the vessel grace fills.

The economy of a true shepherd: spend (resources) and be spent (self), gladly, for souls — even unrequited. Paul loves like a parent who lays up for the children (v. 14), not like a hireling who bills them.

Unreturned love is ministry's common wage, and Christ's before Paul's. The servant who must be loved back in proportion will not last; the one constrained by Christ's love (5:14) can love at a loss.