And when evening came, the boat was out on the sea, and he was alone on the land. And he saw that they were making headway painfully, for the wind was against them. And about the fourth watch of the night he came to them, walking on the sea. He meant to pass by them, but when they saw him walking on the sea they thought it was a ghost, and cried out; for they all saw him, and were terrified. But immediately he spoke to them and said, "Take heart, it is I; have no fear." And he got into the boat with them and the wind ceased. And they were utterly astounded, for they did not understand about the loaves, but their hearts were hardened.
Mark 6:47–52 (RSV)
If anyone should say to you that they understand the Lord perfectly and completely, smile at them pleasantly and find an excuse to get away. The chances are that they want to sell you their latest book, "How To Know Everything About Jesus", or are looking to add you to their cult.
The Lord has revealed Himself to us, as much as you or I could understand. We have learned much over the ages, but everything, no that lies beyond us. St. Mark's Gospel shows the disciples as always a step or two behind understanding Jesus and His purpose.
An honest Christian agrees to this. We have no idea how the Lord walked on water or fed five thousand with a few loaves and fish. We grasp that the wind and waves obey Him, for He is their Creator Lord. Our hearts may be confused, even hardened, when it comes to explaining why Jesus did one thing and not another.
Faith is not, nor has it been, about the depth of our knowledge of Jesus. Salvation is not found in how much we know, or think we know, about Jesus. Saving faith is located in the Lord who says to us, 'Take heart, it is I; have no fear.'
It is Jesus who comes to us in the middle of our trials and confusion. We soon discover that Jesus is not a guru who will give us the secret wisdom of life. He would not give us such a useless thing. Jesus gives us Himself, for He is life. His presence is the center of our lives, of our faith, and our salvation.