“When a philosopher happens to read some of his older texts, and most of the time he shakes his head in disapproval, he can be sure that he is on the right path. For this is an infallible sign that his thought has evolved and that he possesses the capacity to learn, to unlearn, to adapt. He is brave enough to acknowledge that he may have been naive, and this, at the same time, is a useful reminder that he might be wrong even with his current views. Thus, he protects himself against arrogance and intransigence.”