Hume asks us to consider what impression gives us our concept of self. We tend to think of ourselves as selves—stable entities that exist over time. But no matter how closely we examine our own experiences, we never observe anything beyond a series of transient feelings, sensations, and impressions. We cannot observe ourselves, or what we are, in a unified way. There is no impression of the “self” that ties our particular impressions together. In other words, we can never be directly aware of ourselves, only of what we are experiencing at any given moment.
Although the relations between our ideas, feelings, and so on, may be traced through time by memory, there is no real evidence of any core that connects them. This argument also applies to the concept of the soul. Hume suggests that the self is just a bundle of perceptions, like links in a chain. To look for a unifying self beyond those perceptions is like looking for a chain apart from the links that constitute it. Hume argues that our concept of the self is a result of our natural habit of attributing unified existence to any collection of associated parts. This belief is natural, but there is no logical support for it.