'Heart' in the Bible

And I set my mind to seek and explore by [man’s] wisdom all [human activity] that has been done under heaven. It is a miserable business and a burdensome task which God has given the sons of men with which to be busy and distressed.

Whatever my eyes looked at with desire I did not refuse them. I did not withhold from my heart any pleasure, for my heart was pleased because of all my labor; and this was my reward for all my labor.

Then I said to myself, “As it happens to the fool, so death will also happen to me. What use is it then for me to be extremely wise?” Then I said in my heart, “This too is vanity (meaningless).”

So I turned aside and let my heart despair over all the fruit of my labor for which I had labored under the sun.

For what does a man get from all his labor and from the striving and sorrow of his heart with which he labors under the sun?

I said to myself, “God will judge both the righteous and the wicked,” for there is a time [appointed] for every matter and for every deed.

I said to myself regarding the sons of men, “God is surely testing them in order for them to see that [by themselves, without God] they are [only] animals.”

Do not be hasty with your mouth [speaking careless words or vows] or impulsive in thought to bring up a matter before God. For God is in heaven and you are on earth; therefore let your words be few.

For he will not often consider the [troubled] days of his life, because God keeps him occupied and focused on the joy of his heart [and the tranquility of God indwells him].

It is better to go to the house of mourningThan to go to the house of feasting,For that [day of death] is the end of every man,And the living will take it to heart and solemnly ponder its meaning.

Sorrow is better than laughter,For when a face is sad (deep in thought) the heart may be happy [because it is growing in wisdom].

The heart of the wise [learns when it] is in the house of mourning,But the heart of fools is [senseless] in the house of pleasure.

for you also know that you too have cursed others many times.

I turned around and directed my heart to know, to investigate and to seek [skillful and godly] wisdom and the reason for things, and to know that wickedness is folly and that foolishness is madness [leading to stupidity and recklessness].

And I discovered that [of all irrational sins none has been so destructive in beguiling one away from God as immoral women for] more bitter than death is the woman whose heart is [composed of] snares and nets, and whose hands are chains. Whoever pleases God will escape from her, but the sinner will be taken captive by her [evil].

For I have taken all this to heart, exploring and examining it all, how the righteous (those in right standing with God) and the wise and their deeds are in the hands of God. No man knows whether it will be love or hatred; anything awaits him.

Go your way, eat your bread with joy and drink your wine with a cheerful heart [if you are righteous, wise, and in the hands of God]; for God has already approved and accepted your works.

A wise man’s heart turns him toward the right [which is the way of blessing], but a fool’s heart turns him toward the left [which is the way of condemnation].

Even when a fool walks along the road, his [common] sense and good judgment fail him and he demonstrates to everyone that he is a fool.

Rejoice, young man, in your childhood, and let your heart be pleasant in the days of your young manhood. And walk in the ways of your heart and in the desires of your eyes, but know that God will bring you into judgment for all these things.

Therefore, remove sorrow and anger from your heart and put away pain from your body, for childhood and the prime of life are fleeting.