'Hearts' in the Bible

And I will bring a piece of bread to refresh and sustain you; after that you may go on, since you have come to your servant.” And they replied, “Do as you have said.”

And he said to his brothers, “My money has been returned! Here it is in my sack!” And their hearts sank, and they were afraid and turned trembling to one another, saying, “What is this that God has done to us?”

So now, do not be afraid; I will provide for you and support you and your little ones.” So he comforted them [giving them encouragement and hope] and spoke [with kindness] to their hearts.