John Calvin on John 6:25

25. On the other side of the sea. We have already said that Capernaum was not situated on the opposite shore; for Tiberias is situated on that part of the lake where it is broadest, Bethsaida follows next, and Capernaum lies near the lowest part, not far from where the river Jordan issues from the lake. Now, when John places it on the other side of the lake itself, we must not understand him as if its position were directly across, but because, at the lower extremity, the lake made a large winding, and, on account of the bay that intervened, it was impossible to go by land without a very circuitous journey. The Evangelist therefore says, on the other side of the sea, adopting the mode of expression used by the common people, because the only direct and ordinary mode of conveyance was by a boat.

John 6:26-29

26. Jesus answered them, and said, Verily, verily, I say to you, You seek me, not because you saw miracles, but because you ate of the loaves, and were satisfied. 27. Labour for food, not that which perisheth, but the food which endureth to eternal life, which the Son of man shall give to you; for him hath God the Father sealed. 28. They said therefore to him, What shall we do, that we may work the works of God? 29. Jesus answered and said to them, This is the work of God, that you may believe in him whom he hath sent.