“Strenuous intellectual work and looking at God’s nature are the reconciling, fortifying yet relentlessly strict angels that shall lead me through all of life’s troubles,” he had written to the mother of his first girlfriend. Then as now, he could escape the complexity of human emotions by delving into the mathematical elegance that could describe the cosmos. “My husband sticks fearsomely to his calculations,” Elsa wrote Watters. “I have never seen him so engrossed in his work.”