One of my favorite ideas on the philosophy of teaching comes from Thomas Sowell. I try my best to live by this.
My job was to teach them economics, not teach them what I happen to believe," says Mr. Sowell, who adds that efforts by some today to counterbalance the prevailing liberalism in academia with more right-wing instructors is not only an exercise in futility but a disservice to students. "Even if you succeed in propagandizing the students while they're students, it doesn't tell you much [about how they'll turn out]. I suspect that over half [of the conservatives at the Hoover Institution] were on the left in their 20s. More important, though, let's assume for the sake of argument that, whatever you're propagandizing them with on the left or right, every conclusion you teach them is correct. It's only a matter of time before all those conclusions are obsolete because entirely different issues are going to arise over the lifetimes of these students. And so, if you haven't taught them how to weigh one argument against another, you haven't taught them anything.