“Knowing too much about other people puts you in their power, they have a claim on you, you are forced to understand their reasons for doing things and then you are weakened.”

Socrates speaking to Alcibiades
Alcibiades I

"Elements of Success", as published in President Garfield and education: Hiram college memorial https://archive.org/details/presidentgarfiel00hinsuoft (1882), compiled by B. A. Hinsdale, p. 327

Source: Information, The New Language of Science (2003), Chapter 7, A Battle Among Giants, Reductionism and emergence, p. 54

The Moral Maze, BBC Radio 4, October 1st, 2008.

Preface. p. xi.
Understanding Uncertainty (2006)

Professor Van Helsing to Dr. Seward
Dracula (1897)
Context: You reason well, and your wit is bold, but you are too prejudiced. You do not let your eyes see nor your ears hear, and that which is outside your daily life is not of account to you. Do you not think that there are things which you cannot understand, and yet which are, that some people see things that others cannot? But there are things old and new which must not be contemplated by men's eyes, because they know, or think they know, some things which other men have told them. Ah, it is the fault of our science that it wants to explain all, and if it explain not, then it says there is nothing to explain. But yet we see around us every day the growth of new beliefs, which think themselves new, and which are yet but the old, which pretend to be young, like the fine ladies at the opera.

Source: Sometimes the Magic Works: Lessons from a Writing Life