Spoilers From “Day of the Doctor”
The Tenth Doctor glared at his older self. How could he forget? How could he even begin to let go of the number of children that burnt on Gallifrey that day? How could four hundred years be all that it took to forget and move on? Where could he move onto?
"No, no, no. For once I would like to know where I’m going." He demanded of himself.
"No. you really wouldn’t." His big-chinned self retorted.
And then he looked his future self in the eyes, really looked for the first time and suddenly, he saw. He saw how much older he was.
He remembered that woman from the Library, River Song, and how she remarked at how young he was. He finally understood what she had meant. She had known this Doctor, had seen the darkness and age and wear of these eyes. Something had happened. Something else had come along to push memories of Gallifrey into the back of his mind. The guilt was still there, but it was hidden behind the guilt and weight of other deeds to come. Did he really want to know what came next?