But in the depths of his heart, the older he became, and the more intimately he knew his brother, the more and more frequently the thought struck him that this faculty of working for the public good, of which he felt himself utterly devoid, was possibly not so much a quality as a lack of something --not a lack of good, honest, noble desires and tastes, but a lack of vital force, of what is called heart, of that impulse which drives a man to choose someone out of the innumerable paths of life, and to care only for that one.