What Jesus did here in Cana of Galilee was the first of the signs through which he revealed his glory; and his disciples believed in him.
John 2:11
When Jesus changed the water into wine at the wedding in Cana of Galilee, His discples believed in Him right away. They knew this was something that no ordinary man could do. They didn't need to process that miracle or sign. Right away they understood that it meant that Jesus was the Messiah.
But later in the same chapter Jesus does something that took the disciples longer to understand... a lot longer. Jesus made a whip out of cords, drove the sheep and cattle out of the temple courts and scattered the coins of the moneychangers. When the Jews questioned Jesus about this He said, “Destroy this temple, and I will raise it again in three days.” (John 2:19). In the moment, no one (not even the disciples) understood that Jesus wasn't talking about the massive temple complex but about His own body. But, John 2:22 tells us something that I think is important.
After he was raised from the dead, his disciples recalled what he had said. Then they believed the scripture and the words that Jesus had spoken. (John 2:22)
It wasn't until after Jesus was raised from the dead that His disciples understood and believed what He had said. That particular saying was too hard for them to receive at that moment. They couldn't understand it and therefore they couldn't believe it. They weren't ready for it. They needed time and further revelation from God to make sense of it.
Sometimes it's the same for us. Sometimes we read something in the Bible or hear the Spirit whisper something to our spirit and we just don't understand it. We aren't ready to receieve it. We can't bring ourselves to believe it... yet.
In those moments, I want to encourage you not to give it more time. As Christians we don't reject what we read in the Bible and don't understand. We give it more time. It's okay to admit that you don't understand something that God says or does. Keep chewing on it. Keep thinking about it. Give God more time to help you understand and believe it.
Some parts of the Christian faith are easy to accept, and some... take time.