You don’t “deserve” a miracle

Have you ever thought like this?

"If only we could live a very holy life before God, if you can just maintain a sinless life before God, ah… before you say 'God do this…',  it's already done; our words will become commands answered speedily. The reason we are praying and it is hard to get answers is because of our sins. If we can just be holy…"

Ah! If you think like that, you will never work a miracle. If you think God is not hearing you "speedily" like some "holier men of God" because you have not been as perfect as them, hmm… you're distancing yourself from being used mightily by God.
Why do miracles happen? Because people are holy? Do they cease because people are not holy?
Peter and John have performed several miracles before; and they have this to say after healing a lame man at the Beautiful Gate:

And when Peter saw [it], he answered unto the people, Ye men of Israel, why marvel ye at this? or why look ye so earnestly on us, as though by our own power OR HOLINESS WE HAD MADE THIS MAN TO WALK? (Acts 3:12 KJV)

Did you see that? Peter confessed, it's not our holiness actually even though it is this Peter who wrote to the church on the need to "be holy"
But as he which hath called you is holy, so be ye holy in all manner of conversation; Because it is written, Be ye holy; for I am holy. (1 Peter 1:15-16 KJV)

Why do miracles happen?

God gives you his Spirit and works miracles in you. But does he do this because you obey the Law of Moses or because you have heard about Christ and have faith in him? (Galatians 3:5 CEV)
That's the answer we finally got! Miracles happen because we BELIEVE.

And these signs shall follow THEM THAT BELIEVE; In my name shall they cast out devils; they shall speak with new tongues; They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands on the sick, and they shall recover. (Mark 16:17-18 KJV)

And miracles cease when people step out of faith.

And he {Jesus} did not many mighty works there BECAUSE OF THEIR UNBELIEF. (Matthew 13:58 KJV)
Then came the disciples to Jesus apart, and said, WHY COULD NOT WE CAST HIM OUT? And Jesus said unto them, because of your UNBELIEF… (Matthew 17:19-20 KJV)

The world has always been wicked. People have always sinned. But miracles will not cease as long as whenever the son of man comes, He finds FAITH.
Jesus worked "mighty works" amongst UNREPENTANT people

Then began he to upbraid the cities wherein most of his mighty works were done, because THEY REPENTED NOT (Matthew 11:20)

But it was not until He got amidst UNBELIEVING people, the powerful Jesus that we know was grounded.

And he could there do no mighty work, save that he laid his hands upon a few sick folk, and healed [them]. And he marvelled because of their unbelief. (Mark 6:5-6)

Righteous living surely has got its place. However, don't shortchange yourself to try to merit any gift of God: no, not by your standard of disciplined life. So that it may be fulfilled which was written: "He that glorieth, let him glory in the Lord." (1 Corinthians 1:31 KJV)