It's often easier to know what you are not than it is to know what you are.
And in knowing what you are by the deductive method you can know where to beat apply your energy. The old saying goes, "you can't see where you live unless you leave and look at your hometown from the outside looking in". This resonates very clearly for those searching for themselves. If you find this resonance and really apply it, it can lead you to who you are. The deductive method seems to work best for this kind of thing.