"Puritas cordis [purity of heart] means much more than moral or ascetic perfection. It is the end of a long process of spiritual transformation in which the soul, perfect in charity, detached from all created things, free from the movements of inordinate passion, is able to live absorbed in God, and is penetrated from time to time with vivid intuitions of His action, intuitions which plumb the depths of the divine mysteries, which "grasp" God in a secret and intimate experience not only of Who He is, but of what He is doing in the world. The [person] who is pure in heart not only knows God, the Absolute Being, pure Act, but knows Him as the Father of Lights, the Father of Mercies, Who has so loved the world as to give His only begotten Son for its Redemption. Such a [person] knows Him not merely by faith, not by theological speculation, but by intimate and incommunicable experience."
Thomas Merton. Bread in the Wilderness (New York: New Dimensions, 1953): 20-21
Leonard Doohan. Spiritual Leadership and Reflection. (International Journal of Servant-Leadership,2007) 285.