The poor man goes out and comes in unheeded, and when in the midst of a crowd is in the same obscurity as if shut up in his own hovel. Those humble cares and painful attentions which occupy those in his situation, afford no amusement to the dissipated and the gay.
 Adam Smith, The Theory of Moral Sentiments (1759). copy citation

Context

“for though to be overlooked, and to be disapproved of, are things entirely different, yet as obscurity covers us from the day-light of honour and approbation, to feel that we are taken no notice of, necessarily damps the most agreeable hope, and disappoints the most ardent desire, of human nature. The poor man goes out and comes in unheeded, and when in the midst of a crowd is in the same obscurity as if shut up in his own hovel. Those humble cares and painful attentions which occupy those in his situation, afford no amusement to the dissipated and the gay. They turn away their eyes from him, or if the extremity of his distress forces them to look at him, it is only to spurn so disagreeable an object from among them. The fortunate and the proud wonder at the insolence of human wretchedness, that it should dare to present itself before them, and with the loathsome aspect of its misery presume to disturb the serenity of their happiness.” source