'Heart' in the Bible

I neither withheld anything from my eyes that they desired, nor did I deprive any pleasure from my heart. My heart rejoiced in all my toil, for this was my reward from all my toil.

For what does a person receive for all his toil and in the longing of his heart with which he toils under the sun?

All his days [are] painful, his labor [brings] grief, and his heart cannot rest at night. This also [is] vanity!

Do not be rash with your mouth, and do not let your heart be quick to utter a word before God. For God is in heaven, and you [are] on earth; therefore, let your words be few.

For he does not remember the [brief] days of his life, for God keeps his heart preoccupied with enjoyment [of life].

God gives a man wealth, possessions, and honor, so that he lacks nothing his heart desires; yet God does not enable him to enjoy it--instead someone else ends up enjoying it. This [is] vanity--indeed, it [is] a grievous ill!

Even if a man fathers a hundred [children] and lives many years so that the days of his years are many, if his heart is not satisfied with {his prosperity} and {he does not receive a proper burial}, I deem the stillborn better than him.

Better to go to the house of mourning than to go to the house of feasting, for [death is] the end of every person, and the living should take [it] to his heart.

Sorrow [is] better than laughter, for by sadness of countenance the heart is made good.

The heart of the wise [is] in the house of mourning, but the heart of fools [is] in the house of mirth.

Surely oppression makes a fool of the wise, and a bribe corrupts the heart.

For your heart knows that you also have cursed others many times.

I myself found [that] more bitter than death [is] the woman who [is] a trap, whose heart [is] a snare, and whose hands [are] bonds. The one who pleases God escapes from her, but the sinner is caught by her.

What my heart sought, I did not find. Although I found one righteous man among one thousand, I did not find one [upright] woman among all these.

I saw all this as I applied my heart to all the deeds done under the sun: {sometimes those in authority harm others}.

Because sentence against an evil deed is not carried out quickly, the heart of {humans} fills up within them to do evil.

So all this I laid to my heart, and I concluded that the righteous and the wise, as well as their deeds, [are] in the hand of God. So no one knows anything that will [come] to them, whether [it will be] love or hatred.

Go--eat your food with joy, and drink your wine with a merry heart! For God already has approved your deeds.

The heart of the wise [inclines] to his right, but the heart of the fool [inclines] to his left.

Rejoice, O young man, in your youth, and let your heart cheer you in the days of your youth! Follow the ways of your heart and the sight of your eyes-- but know that God will bring you into judgment for all these things.

Banish anxiety from your heart, and put away pain from your body, for youth and vigor [are] vanity.