A smile costs nothing, but gives much.  It enriches those who receive, without making poorer those who give.  It takes but a moment, but the memory of it sometimes lasts forever. A smile creates happiness in the home, fosters goodwill in business, and is the countersign of friendship.  Some people are too tired to give you a smile.  give them one of yours, as no one needs a smile so much as he who has no more to give. 

A smile is a curve that can set a lot of things straight.

when sunbeams tickle twittering leaves and tease reflections in chattering streams, somewhere behind buried clouds the sky must be smiling.

All unknown