It is narrated from Sayyida Aisha (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) used to say to her: "When you are angry or pleased, I can tell your anger or pleasure." She asked: "O Messenger of Allah! How do you know?" He (peace and blessings be upon him) replied: "When you are angry, you say: 'O Muhammad,' and when you are pleased, you say: 'O Messenger of Allah.'"