Smile Quotes

A sexual assault case involving a former Malaysian defence attaché in New Zealand, Muhammad Rizalman Ismail had me going through some of the brainy quotes on smile:

• A warm smile is the universal language of kindness. William Arthur Ward
• Smile, it's free therapy .Douglas Horton
• A smile is the universal welcome. Max Eastman
• We shall never know all the good that a simple smile can do. Mother Teresa
• A smile is the light in your window that tells others that there is a caring, sharing person inside. Denis Waitley

Now, I  wonder. Is there wisdom indeed in brainy quotes?