"When you study the lives of all great achievers--those who have had the greatest influence on others, those who have made things happen--you will find a pattern. Through their persistent efforts and inner struggle, they have greatly expanded their four native human intelligences or capacities. The highest manifestations of these four intelligences are: for mental, vision; for the physical, discipline; for the emotional, passion; for the spiritual, conscience. These manifestations also represent our highest means of expressing our voice."
- Stephen R. Covey