{That they strive not about words} (m(8820)logomachein). Word
apparently coined by Paul from logomachia ( 1Ti 6:4  which
see), a back formation in that case. A mere war of words
displeases Paul. ( Tit 3:9 ). {Useful} (chr(8873)imon). Late and
rare word from chraomai, here only in N.T. {To the subverting}
(epi katastroph(8869)). Old word (from katastreph(935c), to turn down
or over), here only in N.T. (except  2Pe 2:6  in some MSS., not
in Westcott and Hort)." Because of the overthrow" (result epi,
not aim), useless for this reason. Such war of words merely
upsets the hearers.