But reject [have nothing to do with] profane and old wives' fables, and exercise yourself toward godliness.
Do not give heed to fables and endless genealogies, which cause disputes rather than godly edification which is in faith. Now the purpose of the commandment is love from a pure heart, from a good conscience, and from sincere faith, from which some, having strayed, have turned aside to idle talk, desiring to be teachers of the law, understanding neither what they say nor the things which they affirm.
All this was contrary to healthy doctrine. That word sound, or healthy, is peculiar to the Pastoral Epistles, 1Ti_6:3; 2Timothy 1:13; 2Timothy 4:3; Titus1:9; Titus 2:1. It suggests a certain test of the various teachers who cross our paths. The question always is, Do these words of theirs promote the health of the soul, and above all, love out of a pure heart and a good conscience? (F.B. Meyer)