The next sentence is to talk nonsense for the sake of belief and to do big things with a dull head. It describes a person who works hard and has no other bells and whistles. Being dull can be interpreted as burying one's head and focusing on one thing and one mind. Talking nonsense without saying anything also means that one can open the river with faith. , Just talk nonsense, if you want to do great things, you need to work hard and wholeheartedly. If you don't work hard, of course you won't succeed. If you fish in three days and sun in two days, you will definitely not achieve anything if you don't work hard.