The Heart is rebellious. Nothing is closer to the truth – the fact that human hearts are rebellious against God. God the Father, God the Son and God the Holy Spirit speaks through Psalm 2 and us: “Why do the nations rage, And the people plot a vain thing? The kings of the earth set themselves, And the rulers take counsel together, Against the LORD and against His Anointed.

hearts as in the rebellion, in the day of trial in the wilderness,  Hebrews 3:8, 15

The heart can lead you astray, away from God’s precepts.

The heart is evil – this matches the prophecy of Jeremiah ("The heart is deceitful above all things, And desperately wicked; Who can know it? Jeremiah 17:9). However, since a Christians who is saved by the grace of God is born again – he or she has a new heart. The promise of God was established before Christ Jesus came: “I will give you a new heart and put a new spirit within you; I will take the heart of stone out of your flesh and give you a heart of flesh.” Ezekiel 36:26

<Beware, brethren, lest there be in any of you an evil heart of unbelief in departing from the living God Hebrews 3:12

The heart has thoughts and intents – these need to be controlled – it is the word of God which the Bible the speaks as being able to do this. Scripture (ie the bible) and is able to discern good from evil.

heart. Hebrews 4:12

It is on the heart that the law of God is written – the heart of a Christian knows the precepts of God – it speaks to the conscience.

hearts; and I will be their god, and they shall be my people. Hebrews 8:10

hearts, and in their minds I will write them. Hebrews 10:16

The heart can be true – the word here about being in accord with what is true, that is the heart can be trustworthy if it subject to God. There is a command here – to draw near to God but to do so one needs to be holy – this is an act of the heart and mind. The heart needs to be true, not doubting or hypocritical etc.

heart in full assurance of faith, having our hearts sprinkled from an evil conscience and our bodies washed with pure water. Hebrews 10:22

Our heart is established by grace: the issue is the heart must firmly be charged with one doctrine – that which has been established by Christ – not strange doctrines established by men. That is the heart needs to be established rather than being like a seed blown about by the wind, every which way. Here it is by the sovereign favour of God toward his people, - the grace of God. In essence the heart is established by the gospel of the grace of God.

heart be established by grace, not with foods which have not profited those who have been occupied with them. Hebrews 13:9