I think this was episode 10, at this point the themes of the anime where pretty clear but this scene made me tear up and really hammered it home. I think a lot of us or stuck in the same position, wishing we made other choices and dreaming of the life if we had chosen 'right'. But there is only now and we can only be ourselves and there is something important in all of us, its up to you to find that thing and bring it out of yourself.
Without a doubt, this was the best scene in the show. I also like the story Higuchi tells just before this scene, where he runs into an old friend that is embarrassed to see him still in college after many years. "Why would he feel embarrassed? It is not him that had to repeat classes?" "And that is why you are the master indeed." :)