Empiricism is a philosophical approach that defines the core of cognition as the sensory experience of the individual. From the point of view of this school, people can know the world through their senses and personal interaction with nature, and this form of cognition is absolute. Understandably, empiricism implies the supremacy of human self-perception since it is personal experience and experience that filters through to objective knowledge.
Theoretical inquiry and conceptualization are not self-sufficient forms of cognition in this case since they do not operate on experience and sensory sense of the world. For emerging psychology, empiricism showed that any knowledge could be derived from experience; in other words, a focus on experience, not just theoretical insights, is essential.
Consequently, no conjecture or assumption can be valid until it has been proven by empirical practice. Understandably, such arguments have been the reason for the development of the science-based approach to the study of personality.