“In other words, the enjoyment and the contemplation of our inner activities are incompatible. You cannot hope and also think about hoping at the same moment; for in hope we look to hope's object and we interrupt this by (so to speak) turning round to look at the hope itself. (...) The surest way of spoiling a pleasure was to start examining your satisfaction. But if so, it followed that all introspection is in one respect misleading. In introspection, we try to look 'inside ourselves' and see what is going on. But nearly everything that was going on a moment before is stopped by the very act of our turning to look at it. Unfortunately, this does not mean that introspection finds nothing. On the contrary, it finds precisely what is left behind by the suspension of all our normal activities; and what is left behind is mainly mental images and physical sensations. The great error is to mistake this mere sediment for the activities themselves.”