Pandora's Box

Was watching Stephen Chow's Journey to the West: Pandora Box (for the 7th time) on SCV on a certain afternoon... towards the end, Sun Wu Kong said a sentence... and this sentence was subsequently used in several other movies.

I personally find this sentence very emotionally laced, and I like it. I cannot remember the full verse, but its something like the below:

程经有一份真承的爱情摆在我眼前但我却没有珍惜。。。
等到失去了却后悔莫急。。。
世上最痛苦的事莫愧于如此。。。
如果老天能让我再来一次，我会对她说“我爱你”。。。
若要在这句话套上一个期限， 我希望是一万年。