1 Timothy 3:9
but upholding and fully understanding the mystery [that is, the true doctrine] of the [Christian] faith with a clear conscience [resulting from behavior consistent with spiritual maturity].
1 Timothy 1:19
keeping your faith [leaning completely on God with absolute trust and confidence in His guidance] and having a good conscience; for some [people] have rejected [their moral compass] and have made a shipwreck of their faith.
1 Timothy 1:5
But the goal of our instruction is love [which springs] from a pure heart and a good conscience and a sincere faith.
1 Timothy 3:16
And great, we confess, is the mystery [the hidden truth] of godliness:
Was justified and vindicated in the Spirit,
Seen by angels,
Preached among the nations,
Believed on in the world,
Taken up in glory.
2 John 1:9-10
Anyone who runs on ahead and does not remain in the doctrine of Christ [that is, one who is not content with what He taught], does not have God; but the one who continues to remain in the teaching [of Christ does have God], he has both the Father and the Son.