How strange we would look if we came to a doctor with a broken arm, asking for help but not allowing him to touch it. The same can be said of our prayer asking for help, but without faith...
In response to the centurion's request, Jesus did not say something like "let what you ask be done for you" or "your servant has recovered; go." He says: "Go; and as you have believed, let it be done for you" (Matt. 5:13). In this way He tells us the main thing: it is not enough simply to ask; faith is necessary. It is faith that fills the request with "power," makes it real and full. For if one asks someone for help without believing that it can be given, one will scarcely receive it. Besides, if we do not believe that the Lord can help us, we in effect close the road to Him, that is, we simply do not give Him the opportunity to provide that very help.
That is why Christ said: "Have faith in God. For truly I say to you, whoever says to this mountain, 'Be taken up and thrown into the sea,' and does not doubt in his heart, but believes that what he says will come to pass, it will be done for him. Therefore I tell you, whatever you ask in prayer, believe that you have received it, and it will be yours" (Mark 11:23-24).
