Parshat Kedoshim begins with the commandment to "Be holy." How do we
achieve holiness? Nachmanides explains that holiness is the result of
exercising restraint in areas that are permitted to you.
For example, let's say a person keeps kosher. It may be no great
challenge for him to refrain from eating a ham sandwich. But the
question is: When he sits down to eat kosher food, what is his frame of
mind: Does he pronounce a blessing with concentration, appreciating
God's gift of bounty? Does he eat slowly and with dignity? Does he
focus on the fact that the ultimate purpose of food is to nourish the
body - in order to have strength to do good deeds?
The story is told of the Baal Shem Tov, the great kabbalist, who
looked out the window and saw his neighbor sitting at the dinner table.
In the eyes of the Baal Shem Tov, the neighbor appeared not as a human,
but as an ox. The neighbor was eating for purely physical reasons, just
as would an ox (and the holy Baal Shem Tov was able to perceive this).
Although the neighbor was acting in a permitted manner, it was not a
holy one.
Sometimes a child will do something that demonstrates particular
self-discipline, and the parent will say: "You're an angel!" But in
actuality, the child is greater than an angel. An angel is a purely
spiritual being, with no sense of "free will" to choose spirituality
over the mundane. But we humans - every time we make such a choice -
refine our soul, and achieve a level higher and holier than even that
of angels.