And yet perhaps, had I myself been entirely faithful, I should have suffered because of infidelities which I would have been incapable of conceiving, whereas what it tortured me to imagine in Albertine was my own perpetual desire to find favour with fresh ladies, to plan fresh romances, was to suppose her guilty of the glance which I had been unable to resist casting, the other day, even when I was by her side, at the young bicyclists seated at tables in the Bois de Boulogne. As we have no personal knowledge, one might almost say that we can feel no jealousy save of ourselves. Observation counts for little. It is only from the pleasure that we ourselves have felt that we can derive knowledge and grief.