I rented a house once with a swimming pool. When we moved in the water was stagnant and full of creepy crawly things. So, I drained, scrubbed and refilled the pool with water. After a couple of weeks the pool was once again stagnant and full of creepy crawly things. I had to purchase a new pump and filter to keep the water moving to keep stagnation at bay. I have found that faith is much the same way. If you let it stagnate, eventually death grows where life was.
Jesus disciples come to a crisis point in their faith and most of them walked away. They stopped having faith, they stopped believing. In John 6:69 we read: Also we have come to believe and know that You are the Christ, the Son of the living God.” Peter is the one making this declaration of faith in the wake of the exodus of the most of Jesus disciples. Only the twelve remained and Peter is speaking of their abiding faith. Two words in this verse stand out: believe and know. Both words are active and would mean: We have come to believe and still believe and know and still know that you are the Christ the Son of the Living God.
Whereas the departing multitude no longer believed and didn’t know, the remaining did believe and did know, accept for Judas. This is such a picture of how our faith must be: active. We must believe and still believe, we must know and still know. If we let our faith stagnate, death will grow, belief will stop, knowing will vanish and we will fall back into our old empty ways. But we must grow in the grace and knowledge of our Lord Jesus Christ.