For it is difficult for any of us to calculate exactly the extent to which our words or gestures are apparent to others. Partly from the fear of exaggerating our own importance, and also because we enlarge to enormous proportions the field over which the impressions formed by other people in the course of their lives are obliged to extend, we imagine that the incidentals of our speech and of our postures scarcely penetrate the consciousness, still less remain in the memory of those with whom we converse.