Well,Thanks, I knew it was coming from a movie, just couldn't remember from which one, though I would have seen Gandalf pulling this one out. ^^
I did not check if Cicero did actually ever say that phrase, but as a stoic, part of it would be in line with his thinking.
Though at least in my experience, some thing you can control, even if others not.
So, I dislike "sound good phrases" like "if there is the will, there are the means" (without going in the detail of what I think about them), because deny the fact you cannot control everything, but on the other end, just passively waiting for life to happen, is also a receipt for a bad life (and actually, even not taking decisions or initiatives and just waiting for things to happen, is often a decision).
But it is true that people with some kind of disabilities or from certain backgrounds and situation will have it harder than others (I know people who managed despite that, but it's true is more difficult), and that there are many things in life we cannot control, just deal with.