Take this with a grain of salt - I'm a beginner with this sort of stuff - but when I hear 'provided,' it seems to serve the same function as would 'if.' The statement you're referring to would bear the same effect with that substitution made: "You will appreciate cultural differences if you reflect on your own civilization."

So I'd say it's sufficient. At least in this context. I'll leave those other three to others so as not to lead you too far astray! Happy studying!

Edit: thinking this through a bit more... 'provided' be more akin to 'only if,' which of course would indicate a necessary condition. Geez. Sorry for any confusion, hopefully someone who's more certain will comment soon!