“Assume a virtue, if you have it not.” By Maria Popova “The patterns of our lives reveal us. Our habits measure us,” Mary Oliver wrote in contemplating how habit gives shape to our inner lives. “Every smallest stroke of virtue or of vice leaves its never so little scar,” William James asserted a century earlier in his foundational treatise on the psychology of habit. “Good habits, imperceptibly fixed, are far preferable to the precepts of reason,” the pioneering political philosopher…