Heretical (hairetikon). Old adjective from hairesis (haireomai, to choose), a choosing of a party (sect, Act 5:17) or of teaching (2Pe 2:1). Possibly a schism had been started here in Crete.
Refuse (paraitou). Present middle imperative of paraiteò„, to ask from, to beg off from. See same form in 1Ti 4:7; 1Ti 5:11. Possibly an allusion here to Christ’s directions in Mat 18:15-17.