Isaiah 29:13–16 is a scathing divine indictment against superficial, hypocritical worship and man-made traditions.
God condemns people who honor God with their lips while their hearts remain far away. Their worship is driven by vile, man-made laws rather than true devotion.
God condemns those who try to go deep into darkness to hide their plans from God, asking, "Who sees us? Who knows us? ".
God sees everything, we cannot escape God's judgment.
Isaiah 29:15-16.
15 Woe to those who deeply seek to hide their counsel from God and their actions in darkness and say, "Who sees us?" And who knows us?
16 Will the turning of your things be considered pottery because you will say that the work on the maker did not make me? Or will the framed thing be said about the drafter who did not understand it?