believing

Matthew 21:21 

Then Jesus told them,

"I tell you the truth, if you have faith

    and don't doubt,

  you can do things like this

    and so much more.

You can even say to this mountain,

    'May you be lifted up and thrown into the sea,'

  and it will happen.

22 You can pray for anything,

    and if you have faith,

  you will receive it."

This doesn't imply God is a vending machine for our wants.

It does say that if we believe & trust in Him, our requests & concerns become more in line with His thinking.