"Any lifeform in any realm – mineral, vegetable, animal, or human – can be said to undergo “enlightenment.” It is, however, an extremely rare occurrence since it is more than an evolutionary progression: It also implies a discontinuity in its development, a leap to an entirely different level of Being and, most important, a lessening of materiality. What could be heavier and more impenetrable than a rock, the densest of all forms? And yet some rocks undergo a change in their molecular structure, turn into crystals, and so become transparent to the light. Some carbons, under inconceivable heat and pressure, turn into diamonds, and some heavy minerals into other precious stones. p. 6"