Why worry?

Came across this very beautiful quote by Ralph Waldo Emerson:

Some of your hurts you have cured,
And the sharpest you still have survived,
But what torments of grief you endured
From evil that never arrived!

Reminds me of Rajesh Khanna's line in one of my very favourite movies "Anand":
"Hum anae valae kal ki gum ke barae me sochke, aaj ki kushiyon ko kho baituthe hain". (please excuse my rusty Hindi! :) It translates to "We lose out on today's happiness in speculating about tomorrow's problems.")