That too is not scriptural.
2 Corinthians 1:20 (KJV)
For all the promises of God in him [are] yea, and in him Amen, unto the glory of God by us.
Romans 8:32 (KJV)
He that spared not his own Son, but delivered him up for us all, how shall he not with him also freely give us all things?
These verses don't come with caveats like your statement. In the natural, if you are obedient to your parents will they not try their very best to give you all you WANT? Why? Because they know you'll be responsible with it. If you're disobedient, living in sin, to your parents, will they help you enable that sin? No. It is no difference with God.
Ephesians 3:19-21 (KJV)
And to know the love of Christ, which passeth knowledge, that ye might be filled with all the fulness of God. Now unto him that is able to do exceeding abundantly above all that we ask or think, according to the power that worketh in us, Unto him [be] glory in the church by Christ Jesus throughout all ages, world without end. Amen.
The question then is, are you obedient to God? If you need a car to get around and you pray for a ferrari and you're not obedient to God in your finances, the Spirit will pray for you to get a pinto. It's all about YOUR level of maturity in God. You don't NEED a ferrari and the Spirit knows this. But if you're obedient to Him when you ask Him about your finances and what to do, and you tithe and give offerings, you're going to have the ability to buy your own ferrari. It's God's economics. Obey in all, you can have all. Read the Proverbs, it's all clearly spelled out. We in the West have this microwave mentality - I want it and I want it now. God sees that foolishness and responds in kind.
I used to get wound up about buying the correct car. I'd study the types of vehicles, pray and pray and pray, until one day God said, "You can get whatever you want, if you trust me." So I bought the car I wanted, and it never faltered once. Because of my job, some countries don't allow you to import used cars, so I'd have to go through this again. Again I asked the Lord what should I do and while we were tight on funds one time, I asked the Lord for a DVD player (for the kids) and the payments to be under a certain amount. Both were given to me - though I had to haggle for 3 hours - I got what I wanted. That vehicle was in five different countries and I started to have very minor issues with it so I sold it took the money and upgraded. God will bless you in every way if you're responsible, thinking of Him first, and obedient. There's just no getting around it. Think with the Spirit not like the world.