Believers that are in Christ do not have "hearts trained in greed ". We are a new creation in Christ.
The believers new heart in Christ created in righteousness and holiness: First it was prophesied in the Old Testament.
Ezekiel 36:26 (NASB)
[SUP]26 [/SUP] "Moreover, I will give you a new heart and put a new spirit within you; and I will remove the heart of stone ( old man ) from your flesh and give you a heart of flesh. ( new man in Christ )
Romans 2:29 (NASB)
[SUP]29 [/SUP] But he is a Jew who is one inwardly; and circumcision is that which is of the heart, by the Spirit, not by the letter; and his praise is not from men, butfrom God.
By grace we have been given a new heart that is obedient.
Romans 6:17 (NASB)
[SUP]17 [/SUP] But thanks be to God that though you were slaves of sin, you became obedient from the heart to that form of teaching to which you were committed,
God cleaned house and moved in. God will not dwell in unrighteousness. God through the Holy Spirit is in our inner man now.
Ephesians 3:16-17 (NASB)
[SUP]16 [/SUP] that He would grant you, according to the riches of His glory, to be strengthened with power through His Spirit in the inner man,
[SUP]17 [/SUP] so that Christ may dwell in your hearts through faith; and that you, being rooted and grounded in love,
God sealed us and gave us the Holy Spirit in our new hearts.
2 Corinthians 1:22 (NASB)
[SUP]22[/SUP] who also sealed us and gave us the Spirit in our hearts as a pledge.
We have the Spirit of God's Son in our hearts now.Galatians 4:6 (NASB)
[SUP]6 [/SUP] Because you are sons, God has sent forth the Spirit of His Son into our hearts, crying, "Abba! Father!"
God has cleansed our hearts by faith.Acts 15:8-9 (NASB)
[SUP]8 [/SUP] "And God, who knows the heart, testified to them giving them the Holy Spirit, just as He also did to us;
[SUP]9 [/SUP] and He made no distinction between us and them, cleansing their hearts by faith.
We love from our hearts now as it is pure.1 Timothy 1:5 (NASB)
[SUP]5 [/SUP] But the goal of our instruction is love from a pure heartand a good conscience and a sincere faith.
2 Timothy 2:22 (NASB)
[SUP]22 [/SUP] Now flee from youthful lusts and pursue righteousness, faith, love and peace, with those who call on the Lord from a pure heart. (this is a believer in Christ..hang around them )
1 Peter 3:4 (NASB)
[SUP]4 [/SUP] but let it be thehidden person of the heart, with the imperishable quality of a gentle and quiet spirit, which is precious in the sight of God.
There are more but this should work to show that the believer has a new heart in Christ and does not have a heart trained in greed like an unbeliever.
We still have the flesh to deal with in our bodies and if we are admonished to not to yield to that...but all that is a different subject.