reason,
serenity,
stability,
happiness, cheerful
emotion,
persistence and the other
factors which
man ordinarily considers desirable. The
term comes from the Greek letter
theta (_), which the Greeks used to represent
thought or perhaps
spirit. The
broad definition of
theta as used in
Dianetics and
Scientology is
thought,
life force,
Elan vital, the
spirit, the
soul.
—Ability Congress Approved Glossary, —PTS-SP Approved Glossary, —Conquest of Chaos Approved Glossary (8.7.92)