We are so constituted that our nature is awakened through understanding. True understanding causes a transformation down to the most basic level, forcing us to open up as if there were some aperture between ourselves and external reality.
The impulses and reactions that we have, such as the erotic complex and such, exist and contend with each other out of innocence; for if there were understanding, these would redirect themselves according to that understanding. This assumes a kind of plan, or certain functioning described by the perfect human, which at the moment is shown a dim and shadowy form compared to its potential culmination.