You know that kind of quiver that trembles around through you when you are seeing something so strange and enchanting and wonderful that it is just a fearful joy to be alive and look at it; and you know how you gaze, and your lips turn dry and your breath comes short, but you wouldn't be anywhere but there, not for the world.
The happiness that may emerge from taking a second look is central to Proust's therapeutic conception. It reveals the extent to which our dissatisfactions may be the result of failing to look properly at our lives rather than the result of anything inherently deficient about them.
They're classic themes, which is why I think it's such a great story to look at again. The concept of being loyal to your friends, to the point where you'd even die for them, is a great subject.