Proverbs 30:19

the way of an eagle in the air, both its manner and the fact that the air shows no trace of his having passed through; the way of a serpent upon a rock, which also leaves no marks; the way of a ship In the midst of the sea, whose wake is swiftly obliterated by the waves; and the way of a man with a maid, for such intercourse also leaves no traces which are immediately and directly apparent. Even so can hypocrisy conceal the real condition of the heart and mind, at least for a while.