From the Buddhist standpoint the comprehension of spiritual truth is not a matter of mere intellectual cogitation but of existential actualization. That is, it is a matter of grasping with our whole being the truth towards which we aspire, and of inwardly appropriating that truth in a manner so total and complete that our being becomes transformed into a very reflex and effusion of the truth upon which we stand. The understanding of truth in the context of the spiritual life, in other words, is no affair of accumulating bits and pieces of information publicly accessible and subjectively indifferent; it is, rather, a process of uncovering the deepest truths about ourselves and about the world, and of working the understanding that emerges into the entire complex of the inner life. Hence the use of the words "actualization" and "realization," which bring into the open the ontological backdrop underlying the noetic process.
Nourishing the Roots: Essays on Buddhist Ethics