Carl Rogers:
"The entire theory is built on a single “force of life” he calls the actualizing tendency. It can be defined as the built-in motivation present in every life-form to develop its potentials to the fullest extent possible."
C. George Boeree
http://www.ship.edu/~cgboeree/rogers.html
photocredit: encarta.msn
Click for Video: http://www.carlrogers.info/video.html
+
bravenet.com