Something about his father’s vision of the tree of life struck Nephi more strongly than any other of his father’s visions. Nephi did not ponder the vision that led them from Jerusalem: he believed. Nephi did not request a confirmation of the vision that they could obtain the brass plates. Nephi knew that Yahweh would provide a way. Why did this vision impress him so? The reason is not in the symbolism that Nephi has already described but in its ultimate meaning. That meaning is obviously what he was pondering when he was caught away in vision.