I was wondering the same thing myself this past Sunday, but in my
NASB. There is a discussion of this in BAGD, and the term LOGIKOS
has been a favorite of Greek philosophers since Aristotle, and often
the Hellenistic Jewish philopher Philo). The basic idea can be found
in BAGD's citation of Epictetus, a contemporary of the NT, that (I'm
quoting BAGD) "the singing of hymns is the religious service of man,
as a LOGIKOS = a being endowed with reason." The distinction between
'man and beast' has been attributed to rationality or spirituality,
and these concepts can be merged and co-identified.
Another instance of LOGIKOS with this meaning may be 1Pt2:2 (so NIV,
but not NASB): TO LOGIKON ADOLON GALA = "pure spiritual milk". The
note in BAGD states that LOGIKOS as well as meaning "spiritual" may
mean "metaphorical" in contrast to "literal."
LOGIKOS and related terms (esp. LOGOS) are a set of words that were
borrowed from their Hellenistic philosophical context and transferred
to Christianity. A thorough understanding of both the source and
destination contexts is crucial. Suffice it to say that the NIV is
not idiosyncratic in its rendering -- it is in company with BAGD and
the NASB.
Stephen Carlson
-- Stephen C. Carlson : Poetry speaks of aspirations, scarlson@mindspring.com : and songs chant the words. http://www.mindspring.com/~scarlson/ : -- Shujing 2.35