In almost all walks of life, there seems to exist a 'rule of three'...
 
... from aviation to mathematics; education to chemistry; the survival priorities of water, shelter and food. We expect so many other things in threes, too, from the three blind mice to big red buses.
When it comes to understanding ourselves, we keep coming back to three things that define, complete and motivate the personality; three things that largely determine our words, reactions and our life's direction; these three things, designed by God to draw us into relationship with Him, to answer the big questions of life:
Who am I?
Do I matter?
What's the point?