Here Jesus tells the crowd that they must pray for something and then believe that they have received it, So you must truly believe and have faith and you will be rewarded.
Many times I have had doubts if I was going to be ok in different situations, and every time , My prayers were answered. Some would say it just seemed that way, but I truly believed and was rewarded because of believing. If you question it , then you are lost.
22“Have faith in God,” Jesus answered. 23“Trulyf I tell you, if anyone says to this mountain, ‘Go, throw yourself into the sea,’ and does not doubt in their heart but believes that what they say will happen, it will be done for them. 24Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours. 25And when you stand praying, if you hold anything against anyone, forgive them, so that your Father in heaven may forgive you your sins.” g