Yet I have left me seven thousand in Israel, all the knees which have not bowed unto Baal, and every mouth which hath not kissed him. 1 Kings 19:18
The comfortable information God gives him [Elijah] of the number of Israelites who retained their integrity, though he thought he was left alone. . .In times of the greatest degeneracy and apostasy God has always had, and will have, a remnant faithful to him, some that keep their integrity and do not go down the stream. It is God's work to preserve that remnant, and distinguish them from the rest, for without his grace they could not have distinguished themselves. God's faithful ones are often his hidden ones (ps.83:3) and the visible church is scarcely visible, the wheat lost in the chaff and the gold in the dross, till the sifting, refining, separating day comes. The Lord knows those that are his, though we do not; he sees in secret. There are more good people in the world than some wise and holy men think there are. . .
~ Matthew Henry