'Hearts' in the Bible

it is He who has also put His seal on us [that is, He has appropriated us and certified us as His] and has given us the [Holy] Spirit in our hearts as a pledge [like a security deposit to guarantee the fulfillment of His promise of eternal life].

You are our letter [of recommendation], written in our hearts, recognized and read by everyone.

You show that you are a letter from Christ, delivered by us, written not with ink but with the Spirit of the living God, not on tablets of stone but on tablets of human hearts.

But [in fact] their minds were hardened [for they had lost the ability to understand]; for until this very day at the reading of the old covenant the same veil remains unlifted, because it is removed [only] in Christ.

But to this day whenever Moses is read, a veil [of blindness] lies over their heart;

For God, who said, “Let light shine out of darkness,” is the One who has shone in our hearts to give us the Light of the knowledge of the glory and majesty of God [clearly revealed] in the face of Christ.

There is no limit to our affection for you, but you are limited in your own affection [for us].

Now in the same way as a fair exchange [for our love toward you]—I am speaking as [I would] to children—open wide [your hearts] to us also.

Make room for us in your hearts; we have wronged no one, we have corrupted no one, we have cheated no one.

I do not say this to condemn you, for I have said before that you are [nested] in our hearts [and you will remain there] to die together and to live together [with us].