When I meditate on any scene in Christ's life, I make myself present to it. I imagine I am there, taking part in all the events, speaking, listening, acting. When I return to some scene in my past life, I relive it just as it happened with one difference: this time I get Christ to take an active part in it. Let me give you an example.
Suppose I return to a scene that causes me much distress. An event that brought me humiliation, like a public rebuke, or one that brought me great pain, like the death of a friend. I relive the whole event, in all its painful detail. I feel once more the pain, the loss, the humiliation, the bitterness. This time, however, Jesus is there. What role is he playing? Is he a comforter and strengthener? Is he the one who is causing me this pain and loss? I interact with him, just as I did with the other persons in that event. I seek strength from him, an explanation of what I don't understand; I seek a meaning to the whole event.