Read it through once

Archer had not seen M. Rivière, or heard of him, for nearly thirty years; and that fact gave the measure of his ignorance of Madame Olenska's existence. More than half a lifetime divided them, and she had spent the long interval among people he did not know, in a society he but faintly guessed at, in conditions he would never wholly understand. During that time he had been living with his youthful memory of her; but she had doubtless had other and more tangible companionship. Perhaps she too had kept her memory of him as something apart; but if she had, it must have been like a relic in a small dim chapel, where there was not time to pray every day....