eg

“If one cannot enjoy reading a book over and over again, there is no use in reading it at all.”
― Oscar Wilde

“The wisest are the most annoyed at the loss of time.”
― Dante Alighieri

“The hottest places in hell are reserved for those who, in times of great moral crisis, maintain their neutrality.”
― Dante Alighieri

“Don't just say you have read books. Show that through them you have learned to think better, to be a more discriminating and reflective person. Books are the training weights of the mind. They are very helpful, but it would be a bad mistake to suppose that one has made progress simply by having internalized their contents.”
― Epictetus, The Art of Living: The Classical Manual on Virtue, Happiness and Effectiveness