Correct punctuation is crucial to effective communication. It would be difficult to find a better illustration of this principle than these two letters, which show what a difference the positioning of commas and full stops can make.

Dear John:

I want a man who knows what love is all about.  You are generous, kind, thoughtful.  People who are not like you admit to being useless and inferior.  You have ruined me for other men. I yearn for you. I have no feelings whatsoever when we're apart. I can be forever happy--will you let me be yours?  Jane



Dear John:

I want a man who knows what love is.  All about you are generous, kind, thoughtful people, who are not like you. Admit to being useless and inferior.  You have ruined me.  For other men, I yearn. For you, I have no feelings whatsoever. When we're apart, I can be forever happy.  Will you let me be? Yours, Jane