Michel Daw, stoic teacher, wrote a great piece on indifference titled, The Truth about Stoic Indifference. Linking to it is my Stoic Saturday action.
The thing is, I was actually writing my own post on indifference when Mr. Daw posted his thoughts in our G+ Community. He said much of what I wanted to say, and better, so I'm sitting this weekend out in deference.
Stoics use the term indifference differently than most. In Stoicism, there is the moral sphere of virtue and vice and then there are indifferents. These indifferents, in themselves, have no moral value. So indifference is not a posture that we hold towards the world, it's a category that we use to evaluate our environment. Some things are indifferent, some aren't. Anyway, check out Michel Daw's post, he knows what he's talking about.