'Hearts' in the Bible

in order that their hearts may be cheered, they themselves being welded together in love and enjoying all the advantages of a reasonable certainty, till at last they attain the full knowledge of God's truth, which is Christ Himself.

and let the peace which Christ gives settle all questionings in your hearts, to which peace indeed you were called as belonging to His one Body; and be thankful.

Let the teaching concerning Christ remain as a rich treasure in your hearts. In all wisdom teach and admonish one another with psalms, hymns, and spiritual songs, and sing with grace in your hearts to God.

Whatever you are doing, let your hearts be in your work, as a thing done for the Lord and not for men.

And for this very purpose I send him to you that you may know how we are faring; and that he may cheer your hearts.