'Sincere' in the Bible

All these, being men of war arrayed in battle formation, came to Hebron with a perfect (committed) heart to make David king over all Israel; and all the rest of Israel were also of one mind to make David king.

For their heart was not steadfast toward Him,Nor were they faithful to His covenant.

How blessed and favored by God are those whose way is blameless [those with personal integrity, the upright, the guileless],Who walk in the law [and who are guided by the precepts and revealed will] of the Lord.

May my heart be blameless in Your statutes,So that I will not be ashamed.

They sent their disciples to Him, along with the Herodians, saying, “Teacher, we know that You are sincere and that You teach the way of God truthfully, without concerning Yourself about [what] anyone [thinks or says of Your teachings]; for You are impartial and do not seek anyone’s favor [and You treat all people alike, regardless of status].

They came and said to Him, “Teacher, we know that You are truthful and have no personal bias toward anyone; for You are not influenced by outward appearances or social status, but in truth You teach the way of God. Is it lawful [according to Jewish law and tradition] to pay the poll-tax to [Tiberius] Caesar, or not?

So they watched [for a chance to trap] Him. They sent spies who pretended to be upright and sincere, in order that they might catch Him in some statement [that they could distort and use against Him], so that they could turn Him over to the control and authority of [Pilate] the governor.

Love is to be sincere and active [the real thing—without guile and hypocrisy]. Hate what is evil [detest all ungodliness, do not tolerate wickedness]; hold on tightly to what is good.

My love be with all of you in Christ Jesus. Amen.

But I am afraid that, even as the serpent beguiled Eve by his cunning, your minds may be corrupted and led away from the simplicity of [your sincere and] pure devotion to Christ.

so that you may learn to recognize and treasure what is excellent [identifying the best, and distinguishing moral differences], and that you may be pure and blameless until the day of Christ [actually living lives that lead others away from sin];

Servants, in everything obey those who are your masters on earth, not only with external service, as those who merely please people, but with sincerity of heart because of your fear of the Lord.

But the goal of our instruction is love [which springs] from a pure heart and a good conscience and a sincere faith.

Deacons likewise must be men worthy of respect [honorable, financially ethical, of good character], not double-tongued [speakers of half-truths], not addicted to wine, not greedy for dishonest gain,

I remember your sincere and unqualified faith [the surrendering of your entire self to God in Christ with confident trust in His power, wisdom and goodness, a faith] which first lived in [the heart of] your grandmother Lois and your mother Eunice, and I am confident that it is in you as well.

let us approach [God] with a true and sincere heart in unqualified assurance of faith, having had our hearts sprinkled clean from an evil conscience and our bodies washed with pure water.

Since by your obedience to the truth you have purified yourselves for a sincere love of the believers, [see that you] love one another from the heart [always unselfishly seeking the best for one another],

Beloved, I am now writing you this second letter. In this [as in the first one], I am stirring up your untainted mind to remind you,