Can you actually know?

Now faith is the assurance of things hoped for, the conviction of things not seen. (Hebrews 11:1 ESV)

 The question is how you can know when you don’t need to pray for something any longer. Can you actually know the point at which you can cease asking God and you can begin to thank Him for what you’ve asked for? I believe that you can.
 So I believe that when you come to that vital place where you have the assurance of the thing that you’re hoping for, that you don’t need to ask for it any longer. Now that’s when you come to the place where you have the assurance. That’s the experience of faith, and it’s through this faith that God speaks to us when we pray.
 Now there comes a question: How can you get from God the assurance that you have been heard, the vital conviction that you are being answered? If you’ll pray sincerely for that which you feel would be pleasing to God and you’ll hold on with a fixed determination, you will come to the conviction that you need pray for it no longer. Why? Because the assurance has come into your heart, because you know God has heard you and you don’t have to ask over and over again.
 Now having meditated upon God’s promises, then you come humbly before the Lord with your desire and then you enter into the faith that sees the thing you asked for. —V. B. Berg [1]

 The challenge of faith, in a sense, lies in going without knowing where you are going, leaving without seeing, trusting only a word, trusting only God. —Angelo Casati

[1]  Anchor Assurance of Things Hoped For