In Philip K. Dick's "Ubik," the author explores the idea of personal identity and the importance of establishing solid boundaries in one’s self-system. He suggests that individuals often build their personalities on unconscious influences rather than authentic self-awareness. This lack of clarity can lead to a fragile sense of self that is easily destabilized by external factors, creating feelings of vulnerability when confronted by others.

Moreover, the quote highlights how this precarious self-structure can make individuals feel threatened in the presence of those who possess a stronger or more authentic sense of self. The underlying message is that true self-awareness and the establishment of clear boundaries are vital for personal stability and resilience against external pressures. Thus, the pursuit of authenticity becomes essential for navigating relationships and self-identity.