"If this is from God, He will bring it to pass"

During this same year that followed Khadijah`s death , the Prophet [Allah bless him and give him peace] dreamed that he saw a man who was carrying someone wrapped in a piece of silk. The man said to him :"This is thy wife , so uncover her." The Prophet [Allah bless him and give him peace] lifted the silk and there was A`ishah. But A`ishah was only six years old , and he had passed his fiftieth year.Moreover Abu`Bakr had promised her to Mut`im for his son Jubayr. The Prophet [Allah bless him and give him peace] simply said to himself : "If this be from God , He will bring it to pass."

Source: Muhammad , his life based on the earliest sources, by Martin Lings.