"LET US SMILE"
by WD Nesbit

"THE THING THAT GOES THE FARTHEST TOWARD MAKING LIFE WORTHWHILE,
THAT COSTS THE LEAST AND DOES THE MOST,
IS JUST A PLEASANT SMILE.

IT'S FULL OF WORTH AND GOODNESS TOO,
WITH MANLY KINDNESS BLENT,
IT'S WORTH A MILLION DOLLARS AND IT DOESN'T COST A CENT."

This is from a book called "All Smiles" by Bruce Velick