'Pure' in the Bible

For our reason for confidence is this: the testimony of our conscience, that with pure motives and sincerity which are from God -- not by human wisdom but by the grace of God -- we conducted ourselves in the world, and all the more toward you.

For I am jealous for you with godly jealousy, because I promised you in marriage to one husband, to present you as a pure virgin to Christ.

But I am afraid that just as the serpent deceived Eve by his treachery, your minds may be led astray from a sincere and pure devotion to Christ.