Then he will turn and swallow it, he thought. He did not say that because he knew that if you said a good thing it might not happen. He knew what a huge fish this was and he thought of him moving away in the darkness with the tuna held crosswise in his mouth. At that moment he felt him stop moving but the weight was still there. Then the weight increased and he gave more line. He tightened the pressure of his thumb and finger for a moment and the weight increased and was going straight down. (2.69)
The old man’s fear of bad luck is more prevalent than his hope in good luck.