Augustine of Hippo

(Serm. 88, 13.) For bad or lukewarm Christians are an hindrance to good Christians, who seek to perform the commandments of God. Notwithstanding these cry and faint not; for every Christian at his first setting about to live well and to despise the world, has to endure at the first the censures of cold Christians; but if he persevere, they will soon comply, who but now withstood him.