Every person is not a single but a multiple being, our truest self and best side is our soul which is literally God, hence as the sages teach "Just as God is compassionate – and as neurosurgeons teach, by nature – we are compassionate" – however this soul from God descends into a body and the body has firstly an independent desire to live, secondly, there are those realities that give it pleasure, say food, and pain, say hunger (as is obvious these are instincts, though somewhat necessary, yet taken out of context turn into addictions or phobias which applies to all the natural instincts ,be it intercourse, music, intellectualism etc.) Unique among all animals we have an independent observer or prefrontal lobes that can – though by no means do – rationally, objectively, assess, decide, desire and execute – However this rational side only functions when our instincts don’t, so a person who is either addicted or paranoid, as we see, loses common-sense – the good news though, is that life in fact is growth