Today, give a stranger one of your smiles. It might be the only sunshine he sees all day. – Quoted in P.S. I Love You, compiled by H. Jackson Brown,Jr.
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. – William Penn