In 2 Corinthians 1:14, Paul speaks of mutual boasting on the day of the Lord—building on the same theme of giving cause for boasting from 5:12.

In 2 Corinthians 3:1, Paul denies commending himself again—directly echoes the same self-denial in 5:12, reinforcing his refusal to boast.

In 2 Corinthians 6:4, Paul says 'we commend ourselves as servants'—contrasting with 5:12's 'not commending ourselves', yet showing a different kind of commendation.

In 2 Corinthians 10:12, Paul criticizes those who commend themselves—the same self-commenders he contrasts with heart-boasting in 5:12.

In 2 Corinthians 10:18, Paul states that the Lord's commendation matters, not self-commendation—reinforcing 5:12's distinction between outward and heart.

In 2 Corinthians 11:12-16, Paul exposes false apostles who boast in appearance—exactly the same group he contrasts with heart-boasting in 5:12.

In 2 Corinthians 12:1-9, Paul boasts in weaknesses rather than outward displays—a concrete example of the heart-based boasting encouraged in 5:12.

In 2 Corinthians 12:11, Paul laments that he should have been commended by them—directly tied to 5:12 where he gives them cause to boast about him.

In 2 Corinthians 10:7, Paul directly addresses judging by appearances, the same issue of those who take pride in what is seen.

In 2 Corinthians 10:8, Paul boasts about his authority—a different kind of boasting than the outward appearance he opposes in 5:12.

Proverbs 27:2 advises letting another praise you—Paul applies this in 5:12 by giving the Corinthians cause to boast about him rather than self-praising.

In Galatians 6:12-14, Paul contrasts those who boast in the flesh with boasting in the cross—mirroring 5:12's contrast between outward appearance and heart.

Philippians 1:26 mentions boasting in Paul for Christ's sake, similar to the opportunity to take pride in Paul's group.