Galatians 4:20 shows Paul's desire to be present because he has doubts—contrasting the ideal of being zealous even in absence.

1 Corinthians 15:58 encourages always abounding in the Lord's work—matching the call to be zealous in a good thing always, even when Paul is absent.

Philippians 1:27 urges consistent conduct whether Paul is present or absent—the same 'always' vs. 'only when present' theme.

Philippians 2:12 explicitly contrasts obedience 'in my presence only' versus 'much more in my absence'—direct parallel to not being zealous only when present.

Titus 2:14 describes Christ's people as 'zealous for good works'—directly echoing the good zeal Paul urges to be constant.

In John 2:17, Jesus' disciples recall Psalm 69:9 as He cleanses the temple, showing Christ's consuming zeal as the perfect model for good purpose.

In Numbers 25:11-13, Phinehas's righteous zeal for God's honor illustrates the good purpose for zeal that Paul commends in this verse.

Psalm 69:9 describes consuming zeal for God's house—an example of the wholehearted devotion aligned with the 'good purpose' of zeal.

Psalm 119:139 shows zeal consuming the psalmist because foes forget God's words—another example of zeal for a good purpose.