Terah took Abram his son and Lot the son of Haran, his grandson, and Sarai his daughter-in-law, his son Abram's wife, and they went forth together from Ur of the Chaldeans to go into the land of Canaan, but when they came to Haran, they settled there. -Gen 11:31
In today's world, ambition is rooted in personal desire and the ideal source of it is in a one's own mind. However, when we give the verse above a look, we realize that Abraham's desire to follow his father to Canaan was only realized when God called him to leave his relatives and family.
I always wondered how much Abraham hesitated when God called him to go out towards Canaan, but now, because of this verse, I am led to believe that he might not have hesitated at all. After all this wasn't a new idea to him since he had already been on the way there with his father.
Sometimes, the dreams that God fulfills in our lives are a continuation of something that was started long before we were on the scene. Sometimes, we complete the work that others have begun.