Simplicity is the key to everything. Say what you have to say in the clearest manner and with the least amount of words. Short words of a certain language are usually the oldest ones and therefore the most understandable.
A person who can clearly and simply state who he is, what he wants and what he believes in, knows best how to convey his ideas and thoughts to others. Unfortunately, to most people, this ability is not their strongest point. Nevertheless, here, we talk about those that are grand yet simple; grand, because they are not afraid of simplicity, clear thoughts and honest communication.