24 You see then, my brethren, that all things cry against them, all the divine pages, all prophecy, the whole gospel, all the apostolic letters, every sigh of the dove, and yet they awake not, they do not yet rouse from their sleep. But if we are the dove, let us groan, let us persevere, let us hope; God's compassion will be with you, that the fire of the Holy Spirit may glow in your simplicity; and they will come. There must be no despairing; pray, preach, love; the Lord is able to the utmost. Already they begin to be sensible of their shame; many have become sensible of it, and blushed; Christ will aid, that the rest also may become sensible of it. However, my brethren, at least let the chaff alone remain there; let all the grain be gathered together; let whatever has borne fruit among them return to the ark by the dove.
Source: Tractates on the Gospel of John (New Advent)