Philosophy is a study that lets us be unhappy more intelligently

If many years were added to my life, I would give fifty to the study of the Book of Changes and might thereby manage to avoid great mistakes.

Study without reflection is a waste of time; reflection without study is dangerous

Study the past, if you would divine the future.

If some years were added to my life, I would give fifty to the study of the Yi, and then I might come to be without great faults.

Learning without thought is labor lost; and thought without learning is perilous.