Guard your heart

2 Samuel 11:1-13
David Got up one evening from his bed and walked around on the roof of the palace. From there he saw a beautiful woman bathing, who is Bathsheba, wife of Uriah the Hittite.
David sent messengers to get her and he slept with her. Then she went back home. The woman conceived and sent word to David, saying, " I am pregnant."
David asked Uriah came back from war, tried let him go home sleep with his wife, but Uriah refused to go home for his responsibility to his master.
Why?
His army is fighting the Ammonites, but this spring the king is not with them. He is taking an after-siesta stroll in the cool, on the palace roof. And from his vantage-point he can see down into the open inner courtyard of a nearby house, where the lovely Bathsheba is going through the monthly purification ritual following menstruation經期.
How?
David sinned for he was nothing to do and had lust, adultery mind. Guard your heart, for everything you do flows from it。(Proverbs 4:23)