For there is nothing covered, that shall not be revealed; neither hid, that shall not be known.

People's New Testament

12:2 There is nothing covered. For notes on verse 2-5, see Mt 10:26-28. The flat tops of Eastern houses were the places from whence public proclamations were made.

Jamieson-Fausset-Brown Bible Commentary

2. hid-from knowledge. "Tis no use concealing anything, for all will one day come out. Give free and fearless utterance then to all the truth." (Compare 1Co 4:3, 5).

Matthew Henry's Concise Commentary

12:1-12 A firm belief of the doctrine of God's universal providence, and the extent of it, would satisfy us when in peril, and encourage us to trust God in the way of duty. Providence takes notice of the meanest creatures, even of the sparrows, and therefore of the smallest interests of the disciples of Christ. Those who confess Christ now, shall be owned by him in the great day, before the angels of God. To deter us from denying Christ, and deserting his truths and ways, we are here assured that those who deny Christ, though they may thus save life itself, and though they may gain a kingdom by it, will be great losers at last; for Christ will not know them, will not own them, nor show them favour. But let no trembling, penitent backslider doubt of obtaining forgiveness. This is far different from the determined enmity that is blasphemy against the Holy Ghost, which shall never be forgiven, because it will never be repented of.