But we must not omit to notice the distinction that is drawn between the method of proceeding from your starting-points or principles, and the method of working up to them. Plato used with fitness to raise this question, and to ask whether the right way is from or to your starting-points, as in the racecourse you may run from the judges to the boundary, or vice versa.

Well, we must start from what is known.

But “what is known” may mean two things: “what is known to us,” which is one thing, or “what is known” simply, which is another.

I think it is safe to say that we must start from what is known to us .