And he said unto them, Which of you shall have a friend, and shall go unto him at midnight, and say unto him, Friend, lend me three loaves;
For a friend of mine in his journey is come to me, and I have nothing to set before him?
And he from within shall answer and say, Trouble me not: the door is now shut, and my children are with me in bed; I cannot rise and give thee.
I say unto you, Though he will not rise and give him, because he is his friend, yet because of his persistence he will rise and give him as many as he needs.
And I say unto you, ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you.
For every one that ask receives; and he that seeks finds; and to him that knocks it shall be opened. Luke 11:5-10

Are you tired of asking God something, perhaps you have been asking for a while, keep persisting until the door is opened.