During the course of my life … I have met men who were worth while; but Jack was the one man with whom I have come in personal contact who possessed the qualities of heart and mind that made him one of the world’s overshadowing geniuses.
He was intrinsically kind and irrationally generous …. With an innate refinement, a gentleness that had survived the roughest of associations. Sometimes he would become silent and reflective, but he was never morose or sullen. His silence was an attentive silence. I have known him to end a discussion by merely assuming the attitude of a courteous listener, and when his indiscreet opponent had tangled himself in the web of his own illogic, and had perhaps fallen back upon invective to bolster his position, Jack would calmly roll another cigarette, and throwing his head back, give vent to infectious laughter—infectious because it was never bitter or derisive …. He was always good-natured; he was more—he was charmingly cheerful. If in those days he was beset by melancholia, he concealed it from his companions.