Nigel Warburton challenges the idea of the solitary philosopher:
[I]t was John Stuart Mill who crystallised the importance of having your ideas challenged through engagement with others who disagree with you. In the second chapter of On Liberty (1859), he argued for the immense value of dissenting voices. It is the dissenters who force us to think, who challenge received opinion, who nudge us away from dead dogma to beliefs that have survived critical challenge, the best that we can hope for. Dissenters are of great value even when they are largely or even totally mistaken in their beliefs. As he put it: ‘Both teachers and learners go to sleep at their post, as soon as there is no enemy in the field.’ …
The point of philosophy is not to have a range of facts at your disposal, though that might be useful, nor to become a walking Wikipedia or ambulant data bank: rather, it is to develop the skills and sensitivity to be able to argue about some of the most significant questions we can ask ourselves, questions about reality and appearance, life and death, god and society. As Plato’s Socrates tells us, ‘These are not trivial questions we are discussing here, we are discussing how to live.’
The Dish 