Who has given understanding to the heart? The heart is deceitful above all things and desperately wicked: Who can know it? The Lord tries the hearts: For out of the heart proceed Evil thoughts, murders, adulteries, fornication… Therefore, God gave such as them up to uncleanness through the lusts of their own hearts, to dishonor their own bodies between themselves. The heart of the sons of men is fully set to do Evil: They are corrupt and have done abominable iniquity… The Lord does not see as Man sees; for Man looks at the outward appearance, but the Lord looks at the heart.
Everyone that is proud in heart is an abomination to the Lord: For the wicked boasts of his heart’s desire. The fool has said in his heart: There is no God. He has said in his heart: I shall not be moved, for I shall never be in adversity! Their sword shall enter into their own heart… They prepare their heart like an oven, while they lie in wait: They are all adulterers, as an oven heated by the baker, after he has kneaded the dough until it is leavened. Do you not know that a little leaven leavens the whole lump? Purge out therefore the old leaven, the leaven of malice and wickedness, that you may be a new lump with the unleavened bread of sincerity and truth. You cannot be partakers of the Lord's table, and of the table of devils. The bread of God is He who comes down from Heaven and gives Life to the world! Jesus said: I am the bread of Life. So, cast away all your transgressions and make yourself a new heart and a new spirit: For why will you die? Behold, the days come, says the Lord GOD, that I will send a famine in the land, not a famine of bread, but of hearing the Words of the LORD.
Your Words were found, and I did eat them; and your Word was to me the joy and rejoicing of my heart! For where your treasure is, there will your heart be also: And God will circumcise your heart to love the Lord your God with all your heart and with all your soul, that you may live! His Word was in my heart as a burning fire: My heart was hot within me, while I was musing the fire burned! Did our heart not burn within us, while He opened to us the scriptures?
So, do not put out the Spirit's fire: Do not grieve the Holy Spirit of God, with which you are sealed up to the Day of Redemption. For the Lord shall baptize you with the Holy Spirit and with fire: Whose fan is in his hand, and He will thoroughly purge his floor, and gather His wheat; but He will burn up the chaff with unquenchable fire… The fining pot is for silver, and the furnace for gold: But the LORD tries the hearts. Every man's work shall be made manifest: For the day shall declare it, because it shall be revealed by fire; and the fire shall try every man's work of what sort it is.
Who can say: I have made my heart clean, I am pure from my sin? Therefore, says the Lord: You shall lay-up My words in your heart and in your soul, and bind them for a sign upon your hand, that they may be as frontlets between your eyes. Then, I will give you a new heart and a new Spirit will I put within you: I will take away the stony heart out of your flesh and I will give you a heart of flesh! I will put My law in your hearts: And I will put My Spirit within you and cause you to walk in My statutes and do them. Because you are sons, God will send forth the Spirit of His Son into your hearts: Who also seals us with the Spirit of the Living God; not in tables of stone, but in fleshy tables of the heart. Thus, says the Lord: I will give you one heart, and one way, that you may fear Me forever, for your Good and that of your children after you!
Because your heart was tender and you have humbled yourself before the Lord, I have heard you, says the Lord: And God, who knows the hearts, bears witness, by giving you the Holy Spirit!