for the sexually immoral, for homosexuals, for slave-traders, for liars, for perjurers, and for any other thing contrary to the sound doctrine;
Liars, for false swearers ...  It is the ninth and possibly also the tenth commandment which prompted this.  More than any other point that may be considered mandatory from the teaching in these verses is the fact that it was the Jewish law which was being abused by the false teachers. Philosophical absurdities of the second century are not in the passage at all.