It almost sounds absurd. After everything they've been through, after witnessing execution and resurrection, they go back to work. Peter says, "I'm going fishing." And the others say, "We'll go with you." It's so painfully mundane. After the cosmic drama of resurrection, they return to their boats, their nets, their labor. Maybe because they just needed to eat. Maybe because Judas, who was their money keeper, is dead, and they don't know where the money is. Maybe because routine offers comfort when everything else has been shattered. So they fish all night; they catch nothing.