God’s power is shown in the miracle directly through His own immediate action or
mediately through creatures as means or instruments.

Catholic theologians’ views about miracles:

•  The manifestation of God’s glory and the good of people; to confirm the truth of a mission or a doctrine of faith or morals, to attest the sanctity of God’s servants, to confer benefits and vindicate Divine justice.
• Miracles of Christ were not necessary but “most fitting and altogether in accord with His mission” as a means to attest its truth. At the same time, they place miracles among the strongest and most certain evidences of Divine revelation.
• Miracles have not a physical force, but only a moral force. They do not affect free will. They are not wrought to show the internal truth of the doctrines, but only to give manifest reasons why we should accept the doctrines.

When we kneel to pray we do not always beg God to work miracles or that our lives shall be constant prodigies of His power. The sense of our littleness gives a humble and reverential spirit to our prayer. We trust that God, through His Infinite knowledge and power, will in some way best known to Him bring about what we ask. Hence, by special providences we mean events that happen in the course of nature and of life through the instrumentality of natural laws. We cannot discern either in the event itself or in the manner of its happening any deviation from the known course of things. What we do know, however, is that events shape themselves in response to our prayer.

Source: Catholic Encyclopedia

I am the LORD, the God of all the living! Is anything too difficult for me? (Jeremiah. 32:27)

Jesus did this as the beginning of his signs in Cana in Galilee and so revealed his glory, and his disciples began to believe in him. (John. 2:11)

He said to them, “Because of your little faith. Amen, I say to you, if you have faith the size of a mustard seed, you will say to this mountain, ‘Move from here to there,’ and it will move. Nothing will be impossible for you.” (Matthew. 17:20)

Then many of his disciples who were listening said, “This saying is hard; who can accept it?” Since Jesus knew that his disciples were murmuring about this, he said to them, “Does this shock you? What if you were to see the Son of Man ascending to where he was before? It is the spirit that gives life, while the flesh is of no avail. The words I have spoken to you are spirit and life. (John. 6:60-63)

So extraordinary were the mighty deeds God accomplished at the hands of Paul that when face cloths or aprons that touched his skin were applied to the sick, their diseases left them and the evil spirits came out of them. (1 Corinthians. (19:11-12)