He was familiar enough with pleasure to know it might become jaded or reluctant; but joy was literally foreign to him, a word he would never easily pronounce, an exhilaration that had some other reckless nationality. For this reason, Caro's wholeness in love, her happiness in it, made her exotic.
... although the sufferings of children are the worst, being inextinguishable--children themselves seldom have a proper sense of their own tragedy, discounting and keeping hidden the true horrors of their short lives, humbly imagining real calamity to be some prestigious drama of the grown-up world. [p. 13]