Read this today :

Share your best smiles for your family, don't save them for your clients, colleagues, friends, strangers on the street. Get your priorities straight. It's those smiles that keep your family together and help the love grow.

Brought me to Google and get the rest of this -

A friendly look, a kindly smile, one good act, and life's worthwhile.

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

Every time you smile at someone, it is an action of love, a gift to that person, a beautiful thing. ~Mother Teresa

Keep smiling - it makes people wonder what you've been up to.

Every day you spend without a smile, is a lost day.

Too often we underestimate the power of a touch, a smile, a kind word, a listening ear, an honest compliment, or the smallest act of caring, all of which have the potential to turn a life around.- Leo F. Buscaglia

A smile starts on the lips, A grin spreads to the eyes, A chuckle comes from the belly; But a good laugh bursts forth from the soul, Overflows, and bubbles all around
- Carolyn Birmingham