Lately I've been playing with subjectivity/objectivity. What they can tell us, etc, how we need both in the world.
There's objective reality, and subjective reality. Subjective reality allows you to find your true love, create great art, to become self-empowered -- but can turn you into a narcissist or doormat if over-fed. (We all need 'somebody else's eyes.')
Objective reality allows you to detach emotionally from the world, to observe others and the world as accurately as possible, to make reasonable and responsible decisions. If over-fed, you forsake your inner feelings, cannot go your own way. Become a machine with no will or intent of your own. You begin to lose what really motivates you personally (your intent), so you become automated, boring, driving away personal relationships.
Objectivity is intellectualism, whereas Subjectivity is romanticism. Though the 'back door' process of gathering and sorting out information is subjective, teaching it to the world is objective, as you will be rightfully re-trained or even punished for legally teaching somebody false and/or half-baked information. Objectivity however, is greatly annoying when you try to apply it to somebody's *personal* life.
How to fit in/get along with people. Be appreciated on a wider scale: Be objective
How to become popular/celebrity. A politician, a 'leader of humanity': Be both subjective and objective
How to find 'the one for you'. Be appreciated by fewer individuals, yet more deeply: Be subjective
How to cure neuroticism: practice objectivity. 'Get out of yourself' more and gain more self-confidence by observing the physical environment, not yourself.
How to cure mania/bi-polar/so-called 'ADHD': practice subjectivity. Understand how you're truly coming across to people by internalizing your thoughts. Develops empathy, compassion, and insight.
A lot of people who study a lot and try to do nothing but improve themselves (like geeks and academia types) develop porn addictions because they need to desperately objectivity something, so they have to resort to doing it to other humans too much. (A little objectivity is needed in sexual relationships of course, but not when it develops into something you do too often.) But their lifestyle makes this so pronounced. They have no other outlet, so that's what they turn to.
People who go out of their way to help others, without looking inward, like the classical Extrovert end up meaning well but not truly getting much of anything accomplished as they aren't aware of how much of an asshole they might be being. They go and go and go but still arrive at the exact same spot as they aren't selfishly motivated enough. They need to balance themselves by learning to look inward/be more subjective like Introverts. They after all cannot help somebody if they don't understand them, or if also they don't work on themselves.
If you can always combine and balance the two - within yourself, not rely on the balance from others, that is how you TRULY move up in the world, and become successful. If you always rely on another person to balance you, especially if you are a subjective/introvert- well it's more dangerous for you than it would be for the objective/extrovert of course, but also ties into why introverts gain more help from self-improvement courses etc.