Thanx for your letter. Sure I know what u mean. This letter is quite widely
available on the net. It's called All the Good Things and its author is Sister
Helen P. Mrosla. In this way u can find it easily e.g. 
at:

http://www.indiaworld.co.in/subscribe/rec/stories/april7-99confermino.html

http://www.citynet.net/putnam/parents/mark.html

http://quest.syv.com/html/thisistothose.html (more nice stories here)

Read about the story here:
http://homepages.go.com/~qiklinx/thelist.htm