The Bible doesn’t just tell us to pray, but rather to pray believing. If we are specifically told to believe when we pray, then it must be possible to pray and not believe. Therefore, not all prayer brings results.
It’s not enough to exhort men to pray; we must believe what we pray. Believing takes the emphasis off of prayer itself, and puts the focus entirely on God. It is all about Him and His promise to do what He said He would do!
“And all things, whatsoever ye shall ask in prayer, believing, ye shall receive.” – Mathew 21:22(KJV)