'Heart' in the Bible

“Therefore I was angry with this generation,And said, ‘They always go astray in their heart,And they did not know My ways’;

Take care, brethren, that there not be in any one of you an evil, unbelieving heart that falls away from the living God.

For the word of God is living and active and sharper than any two-edged sword, and piercing as far as the division of soul and spirit, of both joints and marrow, and able to judge the thoughts and intentions of the heart.

“This is the covenant that I will make with themAfter those days, says the Lord:I will put My laws upon their heart,And on their mind I will write them,”He then says,

let us draw near with a sincere heart in full assurance of faith, having our hearts sprinkled clean from an evil conscience and our bodies washed with pure water.

For consider Him who has endured such hostility by sinners against Himself, so that you will not grow weary and lose heart.

Do not be carried away by varied and strange teachings; for it is good for the heart to be strengthened by grace, not by foods, through which those who were so occupied were not benefited.