Goddness of Parametric VaR

It is very interesting to recall the Value at Risk (VaR) knowleges I read in various papers, documents about 5 years ago. In the past week, I pull off the training session for a bank on this subject I didn't have much preparation for. Back in those time, the theoretical stuff didn't make much sense then (it could be that my brain wire circuits have not been completed yet). I simply chew and swollow the facts and theories without connecting them together. Now I think it was a miracle that I have survived. Perhaps it just takes time to let the raw knowledge sit and brew into something useful.