John 2:11-12 WEB
This beginning of his signs Jesus did in Cana of Galilee, and revealed his glory; and his disciples believed in him.  After this, he went down to Capernaum, he, and his mother, his brothers, and his disciples; and they stayed there a few days.
Jesus was approximately 30 years old when He publicly revealed His glory. That implies that He carried His anointing without telling anyone for a period. When He did finally reveal His glory the text scripture says it caused His disciples to believe. However, because His disciples were at the wedding, it appears they already believed. They had reason to believe based on the testimony of John the Baptist. Considering two of John’s disciples, Andrew, and Philip, went to follow Jesus, there is a clear argument that they believed before this miracle. So why does the text scripture say the first miracle caused them to believe? The disciples already believed based on the things they heard Jesus say and the testimony of John the Baptist. However, the miraculous sign gave them greater assurance of that belief. In other words, they believed more. It is unlikely the disciples saw great miracles every day. In modern times there are men and women of God that pray for miracles and see them come to pass. Still, they do not see miracles every time they pray. They persist in their faith and obedience and some of those times God intervenes in astonishing ways. Signs happen for everyone. The key is making a mental note, allowing your belief to deepen, and then during periods when things are normal, choosing to remain in that new level of belief.
Lord Jesus, please help me remain in belief. Answer my prayers Lord for that deepens my belief and delivers me from doubt. In Jesus’ name, amen.