On the same day that Jesus cursed the fig tree, he went into the temple and threw out all who bought and sold there, and overthrew the tables of the money changers (v15 of chapter 11).
17. And he taught, saying unto them, Is it not written, My house shall be called by all nations the house of prayer? but ye have made it a den of thieves.
The scribes and chief priests did not like his teaching one bit. They wanted to destroy him. They liked the way they had things going before Jesus showed up! Most likely overcharging people for doves to sacrifice, paying more attention to the doctrine of men than the law of God.
The next day Jesus and his disciples went by the fig tree once again. This time it had withered, all the way to the roots. Peter pointed out the tree that Jesus had cursed.
22. And Jesus answering saith unto them, Have faith in God.
23. For verily I say unto you, That whosoever shall say unto this mountain, Be thou removed, and be thou cast into the sea; and shall not doubt in his heart, but shall believe that those things which he saith shall come to pass; he shall have whatsoever he saith.
24. Therefore I say unto you, What things soever ye desire, when ye pray, believe that ye receive them, and ye shall have them.
25. And when ye stand praying, forgive, if ye have ought against any: that your Father also which is in heaven may forgive you your trespasses.
26. But if ye do not forgive, neither will your Father which is in heaven forgive your trespasses.
Jesus told the disciples to have faith; to believe without doubt that they would receive what they asked in prayer and they would receive it. Not necessarily a Mazzarati (sp?) when a more practical car would do better. But do ask God for what you need and want.
Don't forget the warning he also gave. If there is a problem between you and someone else, you need to take care of it first. If you do not forgive others for what they do to you, God will not forgive you of your wrong doings. Why would we let personal grievances keep us from heaven?
Have a wonderful day.