Use of tongue

There is a reason why tongue doesn't have any bones in it. So that you don't pick up a bone with anyone using harsh words. Tongue is flexible as it is all muscle and imparts a valuable lesson to be flexible while communicating. Tongue is pink in color and loses its color when ill, shows that your talk should always result a pink blush on other person.
Tongue stays inside the mouth teaching that all negative and hurtful words should stay inside and not be spoken aloud.
So many things to learn from the tongue.