When you were born, everyone was smiling but you were crying. Live such a life that when you depart, everyone is weeping but you are smiling. - Sa'di of Shiraz
I expect to pass through life but once. If therefore, there be any kindness I can show, or any good thing I can do to any fellow being, let me do it now, and not defer or neglect it, as I shall not pass this way again.