Hazrat Ibn Abbas (may Allah be pleased with them both), in the explanation of the verse of the Holy Qur'an: "Allah knows the deceit of the eyes and what the hearts conceal," says that sometimes a man is sitting among some people and a woman passes by there. He makes the people believe that he has lowered his gaze, but if he finds that the people are heedless of him, he starts looking at the woman, and if he fears that people might see him, he lowers his gaze. Allah Almighty is aware of the thoughts in his heart, that the man even wants to look at the hidden parts of the woman.