There are always waves in the ocean - sometimes small and sometimes large but always present. The ocean can be shallow when first entered into but then go to great depths. The seasons can affect the ocean. People can pollute the ocean. There are many complexities below the surface of the ocean and it is constantly changing.
Now relate this to our emotions or our lives. There are many bright sunny days, but also many storms and many days somewhere in between. Our emotions or also trials in life can come in waves- sometimes small and sometimes large but always present. When we meet people we only see the surface, but as we get to know them we can see their depth of character. The seasons in our lives can affect how we feel. Additionally, just as we can pollute the ocean we can also pollute each other with the things we say and how we treat each other. Some pollution can be easy to clean up such as picking up a piece of trash but others are more like the great oil spills that take huge amounts of time and effort to recover from. Don't cause an "emotional oil spill" for someone. And just as the ocean is constantly changing we can also change and grow as we learn from our experiences in life.
Now that you are thinking about this ocean I want you to picture a wooden fishing boat from the time of Christ. This boat is out in the ocean during a terrible storm. You are on this boat. You are with Christ's apostles and you look up and see someone walking across the water. Christ is coming toward the boat and is calming the storm. Just as Christ had the power to walk on the water and calm the storm, if you allow him, he can walk into your heart and calm your troubled water.
Additional study: Matthew 14:22-33
