I would say that an advanced soul (or in my mind, intellectually enlightened) is one that seeks the most logical conclusions, does not use
coercion to meet goals, and ever seeks to expand his or her own understanding of the world, universe, and multiverse they inhabit.
I do think that ones capacity to rationally is also an indicator of an advanced soul
I think we can divide the human being into three aspects: Body, Mind and Spirit. There are those who are predominately about body, they live their
life seeking basic pleasures like food, sex, power. It is their main drive of their life and they are physical beings. These are equivalent to
beginner souls.
There are those who are predominately about their mind, though they have to fulfill the bodies needs, they only so to seek higher goals in life such
as beauty/art meaning, justice, knowledge for its sake. Their main drive of is the intellect and they are scientific and logical beings. These are
equivalent of the intermediate souls.
Then there are those who are predominantly about their soul. They only meet their body and minds needs as far as is required to seek the highest goal
of life bliss and union with the world. They are the ones that seriously ponder over the deepest mysteries of life such as what is the meaning of
life, what is the source of being, what is the relationship between us and the universe. These are the equivalent of the advanced souls.
Each one has its own rationality, it's own logic. If you see yourself as a physical being then your highest good is food, sex and power. If you see
yourself as an intellectual being, then your highest good is contemplation over ideas(art, science etc) If you see yourself as a spiritual being, then
your highest good is self-realization
Many pleasurable things are logical as well. The orgasm is a good example. Sex feels good, but it is also necessary.
It depends on how you define yourself. For a physical being sex is logical. We should get it whenever we can and get loads of it. For an intellectual
being knowledge is logical. And for a spiritual being self-realization is logical.
Krishna is talking from the perspective of a spiritual being. For a spiritual being sense-objects do not give fulfillment.
[edit on 2-1-2010 by Indigo_Child]