Paul says:

But as for you, speak the things which are fitting for sound doctrine. ~Titus 2:1

Which presupposes that there is “Sound Doctrine.” I wonder, today, what this might correlate to? Calvinist ‘sound doctrine’, Arminian, Baptisitic, Methodist, Lutheran, Barthian dialectic, Free Grace, etc. There surely is a reference, an attainable matrix for understanding the “Sound Doctrine” that Paul is referring to; but what is it?

My little denominational, doctrinal list above mentions disparate approaches to the “finer” points and approaches to articulating Christian doctrine. I would suggest that “Sound Doctrine,” in the Titus context (see the rest of chapter 2), is more concerned with emphasizing the more general points of Christian teaching; viz. Who God is (all Christians agree on this, e.g. Trinity), How He has revealed Himself (all Christians agree on this, e.g. Christ), How He makes himself known (all Christians agree on this, e.g. the Holy Spirit), And the shape that Christian life should be (all Christians agree on this, e.g. Holy), And finally the hope that all of the above generates and is presupposed by (all Christians agree on this, e.g. eschatology). All of this is covered in Titus 2, and so, again, I want to suggest that these macro-themes are what entails “Sound Doctrine.”