Even when the leaders of Babylonia sent messengers to ask Hezekiah about the sign God had given him, God let Hezekiah give his own answer to test him and to see if he would remain faithful.
Test yourselves and find out if you really are true to your faith. If you pass the test, you will discover that Christ is living in you. But if Christ isn't living in you, you have failed.
He also gave you manna, a kind of food your ancestors had never even heard about. The LORD was testing you to make you trust him, so that later on he could be good to you.
Don't forget how the LORD your God has led you through the desert for the past forty years. He wanted to find out if you were truly willing to obey him and depend on him,
I know everything you have done, including your hard work and how you have endured. I know you won't put up with anyone who is evil. When some people pretended to be apostles, you tested them and found out that they were liars.