'Heart' in the Bible

“Go forth, O daughters of Zion,And gaze on King Solomon with the crownWith which his mother has crowned himOn the day of his wedding,And on the day of his gladness of heart.”

“You have made my heart beat faster, my sister, my bride;You have made my heart beat faster with a single glance of your eyes,With a single strand of your necklace.

“I was asleep but my heart was awake.A voice! My beloved was knocking:‘Open to me, my sister, my darling,My dove, my perfect one!For my head is drenched with dew,My locks with the damp of the night.’

“I opened to my beloved,But my beloved had turned away and had gone!My heart went out to him as he spoke.I searched for him but I did not find him;I called him but he did not answer me.

“Put me like a seal over your heart,Like a seal on your arm.For love is as strong as death,Jealousy is as severe as Sheol;Its flashes are flashes of fire,The very flame of the Lord.