The best books I ever read were from the Foundation series by Isaac Asimov, though I didn't appreciate science-fiction up till then. They have given me insights into mass psychology, influencing decisions at critical moments and in possibly predicting the future. Often useful in everyday situations.
"Never let your sense of morals get in the way of doing what's right."
Salvor Hardin in "The Foundation" by Isaac Asimov
Nijmegen, The Netherlands