Don't put eyes and your heart are set only on dishonest gain?

Jeremiah 22:1-17
Do what is just and right. Rescue from the hand of the oppressor the one who has been robbed. 1)Do no wrong or violence to the foreigner, the fatherless or the widow, and 2)do not shed innocent blood in this place.- if he follow these commands, who will sit on the throne of David for ever. Requirement to a king.
The judgment comes against wicked king of Judah, Jehoahaz.
About Shallum son of Josiah, also called Jehoahaz,who succeeded his father as king of Judah but has gone from this place. He will die in the place where they have led him captive; he will not see this land again. 
Did not your father have food and drink? He did what was right and just, so all went well with him. He defended the cause of the poor and needy, and so all went well. Is that not what it means to know me?” declares the Lord.
¹⁷ “But your eyes and your heart are set only on dishonest gain, on shedding innocent blood and on oppression and extortion.
Why?
The Lord cares about the foreigner, fatherless and widow. These the needy people, treat them them with more tender and love. Rescue them from oppressor.
To be king or a person has authority needs to follow above two basic requirements.
Jehoahaz did not meditated why his father all went well, but he lack food and all go worse. For his father know the Lord and followed God's commands.
Do not set my eyes and heart on dishonest gain. Don't be a greed man.
How?
All of these story is a reminder to me, do not be a greed man, get what I should take, but do not take anything that is not belong to me, or dishonest gain.