My dear friend and co-laborer, Daniel Ritchie, in his recent Face Book post quoted John Owen on the importance of the tithe.
“If all who reside in a godly nation must attend the preaching of the word (2 Chronicles 15:13), then all who reside in a Christian commonwealth must be liable to pay the tithe in order to financially support those who preach the word… Since the hearers of the word are to share with those who teach them (Galatians 6:6), then no man can be exempt from paying the tithe as all men are commanded to hear the word. Wherever, or in what nation soever, there hath been a removal of the maintenance provided in the providence of God for the necessary supportment of the public dispensers of the word, the issue hath been a fatal and irrecoverable disadvantage to the gospel and interest of Christ in those nations." Daniel Ritchie
Resource: John Owen, Two questions concerning the power of the supreme magistrate about religion and the worship of God, with one about tithes, proposed and resolved (Oxford, 1659) in The works of John Owen, ed. W. H. Goold (16 vols, Edinburgh, 1967), xiii, 515-16.