'Heart' in the Bible

And that having the eyes of your heart full of light, you may have knowledge of what is the hope of his purpose, what is the wealth of the glory of his heritage in the saints,

I then, the prisoner in the Lord, make this request from my heart, that you will see that your behaviour is a credit to the position which God's purpose has given you,

Joining with one another in holy songs of praise and of the Spirit, using your voice in songs and making melody in your heart to the Lord;

Servants, do what is ordered by those who are your natural masters, having respect and fear for them, with all your heart, as to Christ;

Not only under your master's eye, as pleasers of men; but as servants of Christ, doing the pleasure of God from the heart;