" Why do we choose the role we presently carry out?"
Some of it is determined by unconscious processes, and some of it is our conscious choice. I think that determinism and free will operate, or better yet cooperate to form our psyche or soul, and that this cooperation is 'guided' by a yet higher organizing factor that many people from time immemorial have referred to as spirit. I think that the word spirit has essentially come to mean 'consciousness' in modern times. Unconsciousness, subconsciousness, consciousness and superconsciousness all contain the root word 'consciousness,' and so all of the degrees of self-conscious awareness (or lack thereof) are on a continuum in the human being, with superconsciousness melding into the "Ground of Being."
The Ground of Being is where human motivation becomes notably metaphysical. It is a point or an interface (the Greeks called it 'nous') wherein the spirit of a human 'emerged' from the Spirit which is the Ground of Being. On a metaphysical level, the whys and wherefores of human motivation ultimately derive from this Ground which is the creative aspect of 'God' or the Logos. Paradoxically we must still choose one side of the duality. Good and evil seem to divide from the Unitary Ground even prior to the birth of humanity. (I put this in the Present tense because mythic time is perpetual - not an 'event' that occurred in time).
The great mythic rebellion in 'Heaven' in which Lucifer [Light Bearer] and 1/3 of the Heavenly Host fall from the very Godhead indicate this division. The division suffuses the entire creation even though the invented doctrine of Original Sin seems to place evil in the human motivational sphere. The mythic fall suggests that the division of Good and Evil occurred before humankind existed, and thus the very Ground of Being (Godhead) either designed it that way or was as incapable of preventing a metaphysical cataclysm as poor Adam and Eve, or mythic parents were incapable of NOT listening to 'the Serpent' on the Tree of Knowledge of Good and Evil! Here then are Western archetypal determinants of behavior, rooted in the Collective Unconscious. Transcending unconscious determinants means choosing, it means free will over determinism. This moves us from the periphery back towards the Transcendental Source.
What of you and I? I choose to squeeze all those determined unconscious processes 'upward' into consciousness, like squeezing an emptying tube of toothpaste (using techniques ranging from dream analysis, to psychedelic trips, to active imagination, etc.), and then subject the whole mind to superconscious scrutiny - the Eye ('I') of God under which we can be purified, burning off the dross and leaving Gold. It means seeking the Light, exposing the dark stuff, transmuting what can be transmuted and burning off the rest. The aim is to make Compassion the Master Motive, the Spiritual Master, and from that mystical apperception, Knowledge will flow, Gnosis type Knowledge that easily informs us how to manifest the Light through our everyday roles. Those roles that do not shed Light, simply have to be left behind for this kind of transformation to occur.
Along The Way, I have found that many everyday needs and desires are met, simply through defocusing on them. The Bible says: "Seek ye first the Kingdom of Heaven and its righteousness, and all things will be added unto ye" (in the King James English), and in principle, at least in my life, this has been the case. Being true to the process of Awakening, after my failed ascetical approach, fleshed out my empty and austere existence.
Hey, ask me where to buy tires, and I'll describe a whole process for Vulcanizing rubber! 
Peace.
-------------------- γνῶθι σαὐτόν - Gnothi Seauton - Know Thyself
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