Success

When you reach the end of your life, everything you experienced in life will boil down to two categories:

"I wish I had" & "I'm glad I did"

One key to a happy life, one definition of success, is to include as many things into "I'm glad I did" as possible, and leave as few things possible in "I wish I had".

What are you thinking of doing? If you are thinking of doing it, you can safely bet that someday you will think of having done it...or not having done it.