John MacArthur Quote on Holiness
The following excerpt is from The MacArthur New Testament Commentary: Galatians.
The most important pursuit for all Christians, individually and corporately, is holiness. The first mission of the church is to honor and glorify God, and He can be honored and glorified by His children only as they grow to be like Him in character. Although evangelism is the cutting edge of the church’s ministry, holiness is the only foundation on which effective evangelism or any other ministry can be built. The supreme priority of the church is holiness, purity of an inward life. God can accomplish whatever He desires through a believer or a church that is holy, but He can do little through one that is not.
MacArthur, John F. (1987). The MacArthur New Testament Commentary: Galatians. Chicago, IL: Moody Publishers. p.174-175.