Feeling nostalgic

Wanted to write a blog about feeling nostalgic, but I can't bring my brain to work properly.
The feeling is like thinking back to the old times which you know that they will not come back but you have spent it fruitfully.. no regrets.. however you still wish you can relive those moments.

I especially feel so after I have read one of my friend's blog article (You will need to be able to read Chinese to understand this). I really do know how he feels.. as I was reading his article.. I also feel like crying sentimentally.