It's possible the apostles didn't believe what they had already seen, so Jesus comes again to reveal himself. It might've been a kind of hangover for the apostles, because they had such joy when they saw Jesus again, and then they had to go back to regular life. Or so they thought. Several of them went fishing, including St. Peter. They didn't catch anything. It reminds me of when Jesus said, "Apart from me, you can do nothing." They thought they saw a man on the beach, and they didn't know it was Jesus. Whether Jesus prevented them from knowing it was him, or whether they couldn't see them because they were a long way off, Jesus wanted to wait until the right moment to let them know it was him. As it turned out, Jesus decided to let the miracle do the talking. They cast their nets on the right side of the boat. St. Peter probably thought he was just being nice to a guy trying to give him advice on fishing. He is a fisherman; I would hope Peter knows
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