"This is the most intimate and sacred and precious figure of the Church’s relationship to Christ ... Christ loved the church, and gave Himself up for it; that He might sanctify it, having cleansed it by the washing of water with the word, that He might present it to Himself a glorious church, not having spot or wrinkle or any such thing; but that it should be holy and without blemish.” (Eph.5:25-27)
We see how this great truth is emphasised in the Song of Solomon, as the Bridegroom addresses the Bride, “Thou art all fair, my love; and there is no spot in thee.” (4:7.) and again, “My sister, my love, my dove, my undefiled.” That is the sort of bride He expects. The church as a bride must be pure".
Arthur Wallis - "The Purity of the Church" - "The Church of Jesus Christ - It's Purity, Power, Pattern And Programme in the context of Today" - Conference at Exmouth, UK - May 1958