Imam Baqir (a.s) said: “One night when the Prophet (a.s) was in Ayeshah's room, she asked him: “O' Prophet of God! Why is it that you always put yourself to so much trouble, even though all your past and future sins are forgiven?” He replied: “O' Ayeshah! Should I not be grateful?” Ayeshah said: “God's Prophet (a.s) always stood up on his toes.” Then the following verse was revealed: “We have not sent down the Quran to thee to be (an occasion) for thy distress.” [The Holy Quran: Ta-ha 20:2]