Be a real Christian, to be is more important than to say

Jeremiah 25:1-14
Jeremiah declared the word form the Lord, all the people of Judah will serve the king of Babylon seventy years. This whole country will become desolate wasteland.
Jeremiah has spoken to them again and again, but they have not listened.
When the seventy years are fulfilled, God will punish the king of Babylon and his nation for their guilt, and will make it desolated forever.
God will repay them according to their deeds and the work of their hands.
Why?
The year of 605, when Nebuchadnezzar of Babylon routed the Egyptians at Carchemish. For 23 years Jeremiah has been repeating God's message, and still the people remain unmoved. Now he tells them that the city will fall and they will serve the Babylonians for 70 years in exile. The judgment of God will also fall on the pagan nations who richly deserve it and on Babylon itself.
God's judgement is according to their deeds and the work of their hands, not on what they spoke. Say I am a christian does not mean is real Christian, but what he  have done.
Why people did not listen to the Lord? for their heart was blocked by the wicked mind.  How sad is a man's heart is dead like a stone, his conscious are lost.
How?
Keep my heart with the Lord, O Lord, keep my heart don't leave away from you for you are my savior and my rock.