Read a book on practicing Zen Buddhism. It is always fun to read up on Buddhism as it is a nice way of thinking. Good stuff to practice and to think about in this book. Zen is life. Be mindful of your life.
Note: at page 150 or so he starts writing about the problems of the world and the future. It was 1974 when he wrote the book, so he had no clue that the agricultural green revolution would be able to feed billions more, that globalization would raise millions out of poverty, and some of his history was ahhhh, odd and probably colored by the revisionist historians reporting in that era.