Philippians 1:22 expresses the same 'fruitful labor' that makes remaining in the flesh necessary — directly parallel to the reasoning here.

Philippians 1:25 continues the same thought: Paul's certainty that he will remain for their progress and joy in faith.

Philippians 1:26 gives the purpose of Paul's remaining — that their boasting in Christ may abound through his presence.

In Philippians 1:20, Paul hopes Christ is honored whether by life or death; here (1:24) he explains why staying (life) is necessary for them.

John 16:7 presents a contrast: Jesus says His departure is necessary for their benefit, while Paul says his remaining is necessary for theirs.