Seek the Lord and His strength; seek His face continually. Remember His wonders which He has done, His marvels, and the judgements uttered by His mouth. (Psalm 105:45 NAS)
Remember His wonders which He has done, His marvels, and the judgements uttered by His mouth
Recall what the Lord has done in the past. Remember the miracles He performed that are recorded in the Bible and know that He'll do it again.
What miracle has God done for you? Need one now? Remember the same miracles that He did in the Bible, and the ones He has done for you or someone else in the past, He can still do. God hasn't changed. He is the same yesterday, today and tomorrow.
But we are required to do something too. We must ask, believe and not doubt. And we have to remember that sometimes the answer is no.