Montaigne accepts, as no other writer had, that our inner lives are double, that all emotions are mixed, and that all conclusions are inconclusive. “In sadness there is some alloy of pleasure,” he writes in the essay called, tellingly, “We Taste Nothing Purely.” “There is some shadow of delicacy and quaintness which smileth and fawneth upon us, even in the lap of melancholy. . . . Painters are of opinion that the motions and wrinkles in the face which serve to weep serve also to laugh. Verily, before one or other be determined to express which, behold the pictures success; you are in doubt toward which one inclineth. And the extremity of laughing intermingles itself with tears.” Having two emotions at once is better than having one emotion repeatedly.
By giving life to this truth, Montaigne animates for the first time an inner human whose contradictions are identical with his conscience. “If I speak diversely of myself, it is because I look diversely upon myself,” he writes, in “On the Inconstancy of Our Actions.” In the writer’s soul, he maintained, all contrarieties are found . . . according to some turn or removing, and in some fashion or other. Shame-faced, bashful, insolent, chaste, luxurious, peevish, prattling, silent, fond, doting, laborious, nice, delicate, ingenious, slow, dull, forward, humorous, debonair, wise, ignorant, false in words, true speaking, both liberal, covetous, and prodigal. All these I perceive in some measure or other to be in mine, according as I stir or turn myself. . . . We are all framed of flaps and patches, and of so shapeless and diverse a contexture, that every piece and every moment playeth his part.
Adam Gopnik, reviewing a biography of Montaigne in The New Yorker, (from here)