'Hearts' in the Bible

as it is righteous for me to think this as to you all, because ye have me in your hearts, and that both in my bonds and in the defence and confirmation of the glad tidings ye are all participators in my grace.

so that you may learn to recognize and treasure what is excellent [identifying the best, and distinguishing moral differences], and that you may be pure and blameless until the day of Christ [actually living lives that lead others away from sin];

But those are preaching Christ in a spirit of competition, not from their hearts, but with the purpose of giving me pain in my prison.

If then there is any comfort in Christ, any help given by love, any uniting of hearts in the Spirit, any loving mercies and pity,

So then, my loved ones, as you have at all times done what I say, not only when I am present, but now much more when I am not with you, give yourselves to working out your salvation with fear in your hearts;

So take him to your hearts in the Lord with all joy, and give honour to such as he is:

And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus.