In the late night Doc might be working at his old and battered microscope, delicately arranging plankton on a slide, moving them with a thread of glass. And there would be three voices singing in him, all singing together. The top voice of his thinking mind would sing, “What lovely little particles, neither plant nor animal but somehow both—the reservoir of all the life in the world, the base supply of food for everyone. If all of these should die, every other living thing might well die as a consequence.” The lower voice of his feeling mind would be singing, “What are you looking for, little man? Is it yourself you’re trying to identify? Are you looking at little things to avoid big things?” And the third voice, which came from his marrow, would sing, “Lonesome! Lonesome! What good is it? Who benefits? Thought is the evasion of feeling. You’re only walling up the leaking loneliness.”

(Sweet Thursday, Steinbeck)