How do you can enhance the impact of your speech?

If it's really important and you really need to make it work, limit your communication to three messages at the most. In communication science this is called 'The Holy Trinity'. The human brain responds best to things that come in threes. The Father, the Son, the Holy Ghost. Freedom, Equality and Fraternity. And, I came saw and conquered. Research shows that rows of three are the easiest to convey and to remember . Hence: The Three graces. The Three Wise Men. Three Blind Mice. Third time's the charm. And: Three Little Pigs.