An “aesthetic emotion” is one that, compared to faith, is just skin-deep. It looks good, and it’s a good emotion to have, but it’s not one that people typically internalize. Johannes again refers to “eternal consciousness,” which he’s previously said helps give life greater meaning. The young girl Johannes describes is similar to Johannes in that she believes in God, but unlike Johannes she confuses certainty with faith. Johannes, however, has a superior understanding of faith and so he knows he doesn’t have it.