The Lord heard his prayer and seen his tears

2 Kings 20:1-21
Hezekiah became ill and was at the point of death. The prophet had said, " you are going to die; you will not recover."
But Hezekiah turned his face to the wall and prayed to the Lord,"Remember, O Lord, how I have walked before you faithfully and with wholehearted devotion and have done what is good in your eyes." And Hezekiah wept bitterly.
The Lord heard his prayer and seen his tears. God healed him and gave him 15 years more.
Hezekiah asked Isaiah, "What will be the sign the Lord will heal me and that I will go up to the temple of the Lord on the third day from now?"
At that time Merodach-Baladan sent Hezekiah letters and a gift, because he had heard of Hezekiah's illness. Hezekiah showed him every treasure in his palace. Isiah said to Hezekiah, "all of these will be carried off to Babylon. Nothing will be left. " says the Lord.
This is one of a number of Old Testament stories in which God 'changes his mind' , taking a more lenient course of action in response to people's pleas.
Babylon at this time was a small state south of Assyria, looking for allies. Isaiah predicts its future power, and the fate of Judah.
Why?
God listen to our prayer, it is possible God changes his mind. For the full heart and tears may touch the Lord.
After Hezekiah be healed, he is proud in what he has, so the Lord said to him all these will be carried off. Nothing will be left. Only the Lord is my inheritance. Build the house in the heaven is more important than on the world.
How?
Pray to the Lord with heart and tear. God is the Lord with mercy and grace! Even we may asked the Lord a sign for his way.