Never underestimate the power of a smile.  It speaks far louder than words.    Do not hold back on this gift that costs
you nothing and takes so little effort. 
Think of those whose face is pulled downward by years of frowning.  The lines disappear when you express love
through the lips.  Yes, that is what a
smile is—a visible expression of love that you can give at any time, but it
takes will to do so when there is no apparent reason.  Can you find a reason?  Merely dip into your heart, where you connect
with the hearts of those around you, and there you will find a few billion or
so reasons.