'Hearts' in the Bible

and He did not need anyone to testify concerning man [and human nature], for He Himself knew what was in man [in their hearts—in the very core of their being].

So when He arrived in Galilee, the Galileans welcomed Him, since they had seen all the things that He did in Jerusalem at the feast; for they too came to the feast.

You do not have His word (Scripture) abiding in you [actually living in your hearts and minds], because you do not believe in Him whom He has sent.

I have come in My Father’s name and with His power, and you do not receive Me [because your minds are closed]; but if another comes in his own name and with no authority or power except his own, you will receive him and give your approval to an imposter.

“He has blinded their eyes and He hardened their heart, to keep them from seeing with their eyes and understanding with their heart and being converted; otherwise, I [their God] would heal them.”

“Do not let your heart be troubled (afraid, cowardly). Believe [confidently] in God and trust in Him, [have faith, hold on to it, rely on it, keep going and] believe also in Me.

Peace I leave with you; My [perfect] peace I give to you; not as the world gives do I give to you. Do not let your heart be troubled, nor let it be afraid. [Let My perfect peace calm you in every circumstance and give you courage and strength for every challenge.]

If you remain in Me and My words remain in you [that is, if we are vitally united and My message lives in your heart], ask whatever you wish and it will be done for you.

But because I have said these things to you, sorrow has filled your hearts [and taken complete possession of them].

So for now you are in grief; but I will see you again, and [then] your hearts will rejoice, and no one will take away from you your [great] joy.

But now I am coming to You; and I say these things [while I am still] in the world so that they may experience My joy made full and complete and perfect within them [filling their hearts with My delight].

and I have made Your name known to them, and will continue to make it known, so that the love with which You have loved Me may be in them [overwhelming their heart], and I [may be] in them.”