It is out of the interplay of meditation, metaphysics, and altruistic action that insight is unfolded. No single element will alone suffice: the conjunction of all three is needed and then only can insight emerge. We cannot in the end escape from this complexity of life. The metaphysician who has not balanced his overmuch thinking with richer feeling, the yogi who has not brought his contemplative tendency into better equilibrium with altruistic action, suffers eventually from psychic ill health and external failures. For he is only one-third or one-half alive.
-- Notebooks Category 20: What Is Philosophy? > Chapter 4: Its Realization Beyond Ecstasy > # 175