Psalm 51:10

And I will give them one heart, and I will put a new spirit within you; and I will take the stony heart out of their flesh, and will give them an heart of flesh:

Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new.

Blessed are the pure in heart: for they shall see God.

Cast away from you all your transgressions, whereby ye have transgressed; and make you a new heart and a new spirit: for why will ye die, O house of Israel?

And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.

And put no difference between us and them, purifying their hearts by faith.

Not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost;

Seeing ye have purified your souls in obeying the truth through the Spirit unto unfeigned love of the brethren, see that ye love one another with a pure heart fervently:

And I will give them one heart, and one way, that they may fear me for ever, for the good of them, and of their children after them:

He that hath clean hands, and a pure heart; who hath not lifted up his soul unto vanity, nor sworn deceitfully.

Who can say, I have made my heart clean, I am pure from my sin?

For we are his workmanship, created in Christ Jesus unto good works, which God hath before ordained that we should walk in them.

Therefore, my beloved brethren, be ye stedfast, unmoveable, always abounding in the work of the Lord, forasmuch as ye know that your labour is not in vain in the Lord.

And have put on the new man, which is renewed in knowledge after the image of him that created him:

Truly God is good to Israel, even to such as are of a clean heart.

A double minded man is unstable in all his ways.

And might not be as their fathers, a stubborn and rebellious generation; a generation that set not their heart aright, and whose spirit was not stedfast with God.

For their heart was not right with him, neither were they stedfast in his covenant.

I have seen thine adulteries, and thy neighings, the lewdness of thy whoredom, and thine abominations on the hills in the fields. Woe unto thee, O Jerusalem! wilt thou not be made clean? when shall it once be?

Who, when he came, and had seen the grace of God, was glad, and exhorted them all, that with purpose of heart they would cleave unto the Lord.