"Really good philosophising requires something more than a razor-sharp brain, something that is sometimes called subtlety of mind, a philosophical sensibility or insight. I call it judgement, which I define somewhat cumbersomely as as a cognitive faculty required to reach conclusions or form theories, the truth or falsity of which cannot be determined by an appeal to facts and/or logic alone. There are numerous examples of this, but perhaps the clearest comes from moral philosophy."