The risks you'll regret most are the ones you did not take.

That reminds me of the opening line from Butthole Surfer's "Sweat Loaf"

Yes Son?
What does regret mean?
Well Son, the funny thing about regret is, it's better to regret something you have done than to regret something you haven't done. And by the way, if you see your mother this weekend, be sure to tell her

S A T A N ! S A T A N ! S A T A N !