This is the confidence we have in approaching God: that if we ask anything according to his will, he hears us.

And if we know that he hears us--whatever we ask--we know that we have what we asked of him.
1 John 5: 14-15

Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you: For every one that asketh, receiveth; and he that seeketh, findeth; and to him that knocketh it shall be opened.
Matthew 7: 7-8