John 21:6 - The resurrected Jesus gives fishing lessons. 
Sometimes you have to start fishin' the other side of the boat.
As followers of The Great Fisherman, we know fishing isn't easy. As they say, "that's why they call it fishing and not catching." Sometimes the fish aren't biting, or they aren't there, or they steal your worm, or they jump off the hook. Sometimes you're using the wrong lure or bait. And other times you stumble into a school of them. The point is fishermen know that change is required for fishin'. That sometimes you have to fish the other side of the boat.
What's your "other side" of the boat?
Peter and some of his buddies know all this. They were professional fisherman. They had been trying all night and were likely exhausted. Then Jesus told them to do something different—to cast their net on the other side of the boat. I wonder if any of them yelled "we tried that once before and it didn't work!" Ever heard that before? 
Have you ever watched a professional bass fishing tournament on TV? They are fascinating to some of us. So here's the thing: The pros don't stay in one spot, they move until they find the right spot for that day and time. The pros also don't keep using the same rod and lure either, they try out different equipment and techniques until their find what works for that moment's conditions. Churches could learn a lot from these fishermen.
When I used to live in Florida, I did a lot of freshwater fishing, and as any Florida fisherman will tell you, alligators will often show interest in what you're doing. I've had more than one go after a lure or try to steal my fish as I reeled it in. Here's a photo from my cellphone (from a safe distance) of one particularly curious gator that lived in the fishin' lake next to my house. We called him "Nippy." A Florida fisherman also learns to keep an eye on the weeds, not to stop fishin'.
When Nippy got too big for our pond, Florida Fish and Wildlife came and took him out. Wish we had nuisance removal for churches, There are some big gators in some of our ponds....
