Quotation comes from Reformedcatholicism.com
There are religious people about, who, I have no doubt, were born of a woman, but they appear to have been suckled by a wolf . . . Some warlike men of this order have had power to found dynasties of thought; but human kindness and brotherly love consort better with the Kingdom of Christ. We are not to be always going about the world searching out heresies, like terrier dogs sniffing for rats, and to be always so confident of our own infallibility that we erect ecclesiastical stakes at which to roast all who differ from us.
Spoken by Charles Spurgeon in an exhortation to pastors.