Light
The road to recovery had been long and hard. How do you recover from your wife dying? How do you ever forgive yourself for not saving her? But he is nearly there, nearly in a place where he can look in the mirror and say "I've done my best". As he walks around the familiar halls of the SGC, he thinks about what could've been. He is at a place in his recovery now where he can see the light at the end of the tunnel. Nowhere near the end, but he can see a place now where he will be ok. Not perfect, never perfect, but ok. And that is more than he ever could have hoped for.