Cross reference
1 Timothy 3:9
9 having the secret of the faith in a pure conscience,
1 Timothy 1:19
19 having faith and a good conscience, which certain having thrust away, concerning the faith did make shipwreck,
1 Timothy 1:5
5 And the end of the charge is love out of a pure heart, and of a good conscience, and of faith unfeigned,
1 Timothy 3:16
16 and, confessedly, great is the secret of piety -- God was manifested in flesh, declared righteous in spirit, seen by messengers, preached among nations, believed on in the world, taken up in glory!
2 John 1:9-10
9 every one who is transgressing, and is not remaining in the teaching of the Christ, hath not God; he who is remaining in the teaching of the Christ, this one hath both the Father and the Son;
10 if any one doth come unto you, and this teaching doth not bear, receive him not into the house, and say not to him, `Hail!'