Take 10 seconds and try this in front of a mirror: Say "beautiful" and then notice the smile on your face as it relaxes. Then say "ugly" and notice the frown on your face as it tenses.
It's psychological. You could do this in any language and discover the identical difference one meaningful word can make in how you feel and in how you greet others.
I received this spiritual guidance on 4/4/16, tested it and was amazed at its truth.