Romans 15:27

Yea, it hath been their good pleasure [The apostle twice notes the free-will or "good pleasure" nature of this offering. It dropped as the ripe fruit of the orchard; it was not squeezed as cider in the mill]; and their debtors they are. [The Gentiles are indebted to the Jews, and hence their offering is but a proper expression of gratitude.] For if the Gentiles have been made partakers of their spiritual things, they owe it to them also to minister unto them in carnal things. [Salvation is from the Jews (John 4:22). If, therefore, the Gentiles received eternal and heavenly treasure from the Jews, how small a matter was it that they make return of temporal and earthly treasure to such benefactors. The Gentile still owes this debt to the Jewish race, for of it came the Christ and the Scriptures. The law here announced might well be remembered by many rich congregations in dealing with their ministers in questions of salary, vacations, etc. (Comp. Luke 16:9) By mentioning this offering, Paul sowed good seed in the heart of the Roman Church--seed promising a harvest of liberality.]