Mark 11:24 The New English Bible (NEB)*
24 I tell you, then, whatever you ask for in prayer, believe that you have received it and it will be yours.
Believe—what a big word! Of course, the context is so important to the final point of receiving. It's not just verse 24. I like how the previous verse says, "has no inward doubts" and takes it even further: "but believes that what he says is happening."
Recently someone suggested I listen to Bruce Lipton. This verse makes me think of the "Biology of Belief" (one of the concepts from his research) and epigenetics. To me, it's the science side of God's design ... where we see the architecture behind the principles and powers God put in place.
*The New English Bible. Cambridge, Great Britain: Oxford University Press; Cambridge University Press, 1961.