What is the difference in Kosher and nonKosher foods?

For some time now, I have felt that there is a deeper meaning to the commandments of what not to eat, especially for a Jew. My main source of this theory has been the pig, or swine. I have felt that there is some spiritual connection to them and what makes them unclean besides what they eat and what they are ( a sewer basically).

I came across this and thought I would add it here to start with.

Spiritual Molecules

Quote :

Many of the rabbinic commentators make reference,
while humbly denying that they know the true answer, to the "spiritual damage"
that derives from non-kosher foods. For example, Rabbi Shimshon Raphael Hirsch
comments on the Torah portion Kedoshim (Lev. 19-20) as follows:

"you must...conscientiously keep...the choice of nourishment...
as the very first preliminary...for spiritual, mental and moral
clarity, purity and holiness...right from the beginning, at the actual forming of
the tissues of your body, the physical formation of the fibers of your brain,
nerves and muscles..."

The forbidden foods are thus not materially poisonous,
but they are harmful to our soul. The dangerous components of pork cannot be
detected by chemists, and the toxicological effects of its consumption cannot be
diagnosed by physicians, but the damage does certainly occur. If we want to
think in terms of molecules, we must think about "spiritual molecules".

In this respect, I once read that there are spiritual poisons in
certain proscribed foods that dull the spiritual senses or, as is put so well in
Yiddish, "stuff up the nose and ears of the soul" to the extent that the
individual can no longer receive spiritual messages. I also heard that the
animals forbidden as food by Torah possess certain spiritual characteristics
which the consumer is in danger of acquiring. Whatever the rationale, spiritual
molecules make more sense than chemical ones.

But they make sense only to one who already believes in the
authority of Torah and that person is already willing to obey the rules without
any rationalizations. To the rest of the world, spiritual molecules are too much
the subject of mystery and superstition. In the spiritual realm, according to
those who consider themselves modern and scientific there are no rules and no
logic -- just a lot of fairy stories, visions, magic, witchcraft and gurus.