You need to know enough philosophy so that the methods of logical analysis are available to you to be used as a tool. One of the most depressing things about educated people today is that so few of them, even among professional intellectuals, are able to follow the steps of a simple logical argument.

You need to know at least one foreign language well enough so that you can read the best literature that that language has produced in the original, and so you…

Finally, and perhaps most importantly, you need to acquire the skills of writing and speaking that make for candor, rigor, and clarity. You cannot think clearl…

You need to know enough of the natural sciences so that you are not a stranger in the world.