Luke 12:2

He either then says this concerning that time when God shall judge the secrets of men, or He says it because however much a man may endeavour to hide the good deeds of another by discredit, good of its own nature cannot be concealed.

Or this is addressed to the Pharisees; as if He said, O Pharisees, what you have spoken in darkness, that is, all your endeavours to tempt me in the secrets of your hearts, shall be heard in the light, for I am the light, and in My light shall be known whatsoever your darkness devises. And what you have spoken in the ear and in closets, that is, whatsoever in whispers you have poured into one another's ears, shall be proclaimed on the housetops, that is, was as audible to me as if it had been cried aloud on the housetops. Herein also you may understand that the light is the Gospel, but the housetop the lofty souls of the Apostles. But whatever things the Pharisees plotted together, were afterwards divulged and heard in the light of the Gospel, the great Herald, the Holy Spirit, presiding over the souls of the Apostles.

Our Lord has introduced a most forcible argument for preserving simplicity, and being zealous for the faith, that we should not after the manner of faithless Jews put one thing in practice, while in words we pretend another, namely, that at the last day the hidden thoughts accusing or else excusing one another, shall be seen to reveal the secrets of our mind. Whence it is added, There is nothing hid which shall not be revealed.