Answer: Although this verse has been challenging for many people, there's nothing mysterious or difficult about the word ask. It's the Greek word aiteô and it simply means to ask or request.
The verse actually goes like this:
"And whatever you ask in prayer, you will receive, if you have faith.” Matthew 21:22 (ESV)
I think what challenges some believers is that this verse sounds a bit like a blank check promise. In other words, all it takes is faith and you can have anything. And believe me, some people have believed that very thing. But wait a second. Our understanding God's Word can't rest on any one single verse. Christians need to have a fuller, more complete understanding of the revelation of Scripture, and that includes the following passage:
And this is the confidence that we have toward him, that if we ask anything according to his will he hears us. 1 John 5:14 (ESV)
John gives us an important insight that adds to our understanding of prayer, faith and receiving what we ask for. He reminds us that our requests need to fall in line with God's own will. So the real key is discovering God's will.