"Your actions speak louder than your words." I'm totally agree with this saying because for me, actions must complement what you are saying. People all around the world have different ways to communicate each other, but it's easier communicate with body language. For example a tourist that comes to Colombia and does not know how to speak spanish, He can communicate with gestures and people may understand him. Thats why non-verbal communication is so important, is like when a teacher is checking if you cheat in the exam, with non-verbal communication people can check if what you are saying is the same of what you are expressing.
In conclusion the non-verbal communication plays a very important roll when you are sharing your thoughts or ideas, because it helps you to check if the person is interested in what you are saying, and to the person to check if you are saying the same with your body language, for example when the english teacher see us yawning or not making eye contact with her, she realize that we are not paying attention even if we are not talking with a partner.