Hannah was speaking in her heart (mind); only her lips were moving, and her voice was not heard, so Eli thought she was drunk.

Hannah’s Song of Thanksgiving

Hannah prayed and said, “My heart rejoices and triumphs in the Lord; My horn (strength) is lifted up in the Lord, My mouth has opened wide [to speak boldly] against my enemies, Because I rejoice in Your salvation.

But I will raise up for Myself a faithful priest who will do according to what is in My heart and in My soul; and I will build him a permanent and enduring house, and he will walk before My anointed forever.

When he arrived, Eli was sitting on his seat by the road, keeping watch, because his heart was anxious about the ark of God. When the man arrived to report [the news] in the city, everyone in the city cried out [to God, for help].

Then Samuel said to all the house of Israel, “If you are returning to the Lord with all your heart, remove the foreign gods and the Ashtaroth (pagan goddesses) from among you and direct your hearts to the Lord and serve Him only; and He will rescue you from the hand of the Philistines.”

Then it happened when Saul turned his back to leave Samuel, God changed his heart; and all those signs came to pass that day.

Samuel said to the people, “Do not be afraid. You have [indeed] done all this evil; yet do not turn away from following the Lord, but serve the Lord with all your heart.

Only fear the Lord [with awe and profound reverence] and serve Him faithfully with all your heart; for consider what great things He has done for you.

But now your kingdom shall not endure. The Lord has sought out for Himself a man (David) after His own heart, and the Lord has appointed him as leader and ruler over His people, because you have not kept (obeyed) what the Lord commanded you.”

And his armor bearer said to him, “Do everything that is in your heart (mind); here I am with you in whatever you think [best].”

But the Lord said to Samuel, “Do not look at his appearance or at the height of his stature, because I have rejected him. For the Lord sees not as man sees; for man looks at the outward appearance, but the Lord looks at the heart.”

Now Eliab his oldest brother heard what he said to the men; and Eliab’s anger burned against David and he said, “Why have you come down here? With whom did you leave those few sheep in the wilderness? I know your presumption (overconfidence) and the evil of your heart; for you have come down in order to see the battle.”

David took these words to heart and was greatly afraid of Achish king of Gath.

But in the morning, when Nabal was sober, and his wife told him these things, his heart died within him and he became [paralyzed and helpless] like a stone.

David Flees to the Philistines

But David said in his heart, “Now I will die one day by the hand of Saul. There is nothing better for me than to escape to the land of the Philistines. Then Saul will give up searching for me inside the borders of Israel, and I will escape from his hand [once and for all].”