You cannot deny that humans have a nature. Moreover, seeing that infants are born with a fine array of gnostic neurons, archetypes and ideas really exist within the human system. Psychology is not a science of reality, albeit what is wrong with studying a system within its confines. In fact, any meta-level of study would have absolutely no direct implications to one’s perception of daily life. Whenever we hear ourselves spoken of reductionisticly, it bears no effect to the holistic image of ourselves; Euclid’s 5th Common Notion: the whole is greater than the part. Thus, if we claim to be sentient, we must at least be aware of our system and its confines. Sure, psychology is greatly folklore, speaking of dreams and delusions, but it is a required aspect of life. Say the Myers-Briggs Indicator, the classifications are not set in stone, say the fundamental particles of the human mind, but each component is a reasonable trait with definite dichotomy. I would continue ta say, that the four traits cover the greater part of pigeonholing personalities, an ideal which I believe to be achievable. As we are of the same species, our synopsis is quite similar, as are our mannerisms. The existence of society stands testament to this.