God is not limited by what limits us
A miracle is an act of God that goes beyond ordinary human ability and the usual course of nature. The Bible presents God as the Creator, so nothing in creation is beyond his authority. After Israel crossed the sea, Moses praised God for his incomparable holiness and mighty works (Exodus 15:11).
That does not mean miracles are magic tricks or proof that people can control God. They are God's works, done in his freedom and power. The psalmist says God makes known his strength among the peoples through his wonders (Psalm 77:14). A miracle can leave someone amazed, of course. More deeply, it calls them to see who God is.
Thou art the God that doest wonders: thou hast declared thy strength among the people.
Miracles point to Jesus
Jesus healed people, fed hungry crowds, calmed the sea and raised the dead. These acts showed real compassion for people in front of him, not indifference to their pain. Yet John also calls Jesus' miracles signs. At Cana, when Jesus turned water into wine, the event revealed his glory and led his disciples towards faith (John 2:11).
The greatest sign is Jesus himself. His resurrection means death does not have the final word, and it stands at the centre of the apostles' message. Peter told the crowd in Jerusalem that God raised Jesus from death, something the disciples testified they had witnessed (Acts 2:32). So a biblical miracle is never only about power. It directs attention towards the living Christ.
This beginning of miracles did Jesus in Cana of Galilee, and manifested forth his glory; and his disciples believed on him.
God still hears prayer
The New Testament encourages believers to pray for those who are ill. James describes elders praying with a sick person and calls the church to pray for one another (James 5:14-16). Christians are free to ask plainly for healing, provision, protection or a changed situation. There is no need to pretend that need does not hurt.
At the same time, faith is not a formula that guarantees a particular result. Paul asked the Lord repeatedly about his own painful weakness, but the answer he received was grace sufficient for him rather than removal of the trouble (2 Corinthians 12:8-9). God may heal suddenly, work through doctors and time, sustain someone in suffering, or answer in a way we cannot yet see.
And he said unto me, My grace is sufficient for thee: for my strength is made perfect in weakness. Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me.
Hope without pretending
Believing God can do miracles gives room for honest hope. It means no diagnosis, grief, broken relationship or impossible-looking situation is too hard for him. Jesus told his disciples that what is impossible with people is possible with God (Luke 18:27).
But God's power should not become a burden placed on suffering people. If a prayer is not answered as hoped, that does not prove they lacked faith or that God has abandoned them. The Bible invites people to bring requests to God with thanksgiving, and it promises a peace that guards hearts and minds in Christ Jesus (Philippians 4:6-7). Keep praying, seek wise practical help where needed, and read the stories of Jesus with open eyes. They show a powerful God who comes near.