There is a way to learn books, but there is no limit to learning the sea.
Indulge in hard work and waste it on fun.
"Indulge in hard work and waste it on frolicking" is a famous saying in "Persuading Learning" written by Han Yu, a famous writer and philosopher in the Tang Dynasty. Later generations often quote this sentence to persuade people to study hard, and only by studying hard can they master knowledge. On the contrary, laziness and playfulness will waste your studies.