{Hold fast the traditions} (	as paradoseis katechete).
Hold down as in  15:2 . Paradosis (tradition) from paradid(936d)i
(pared(936b)a, first aorist active indicative) is an old word and
merely something handed on from one to another. The thing handed
on may be bad as in  Mt 15:2f.  (which see) and contrary to the
will of God ( Mr 7:8f. ) or it may be wholly good as here. There
is a constant conflict between the new and the old in science,
medicine, law, theology. The obscurantist rejects all the new and
holds to the old both true and untrue. New truth must rest upon
old truth and is in harmony with it.