'Heart' in the Bible

My heart is for the commanders of Israel, to those who work willingly among the people. Bless the LORD!

The officials of Issachar were with Deborah, as was the tribe of Issachar and Barak. They rushed out into the valley at his heels along with divisions from Reuben's army. Great was their resolve of heart!

Why did you sit down among the sheepfolds? To hear the bleating of the flocks? Among the divisions of the army of Reuben there was great searching of heart.

Some time later, she asked him, "How can you keep saying "I love you!' when your heart isn't with me? These three times you've lied to me and haven't told me where your great strength lies."