The greatest teacher of philosophy in all of history was Socrates, according to philosopher Peter Kreeft. In 2,400 years, no one has topped him or his Socratic method, teaching not by monologue, but by dialogue; not by lecturing, but by logical questioning. Yet of the hundreds of textbooks for beginning philosophers today, none uses his method.      Kreeft has imagined Socrates University: a log, with Socrates at one end and a typical intelligent modern student beginner at the other, conversing about the problems at the heart of each major division of philosophy.      Nothing teaches more effectively than concrete examples and apprenticeship. Like the real Socrates, this fictionalized version by Kreeft is grounded in common sense and commonsense logic, fair and open-minded on all issues but demanding good reasons for every opinion.