Healthy-minded optimism is inadequate as a philosophy, because the evil it ignores is part of reality and may be the key to life's meaning

But it breaks down impotently as soon as melancholy comes; and even though one be quite free from melancholy one's self, there is no doubt that healthy-mindedness is inadequate as a philosophical doctrine, because the evil facts which it refuses positively to account for are a genuine portion of reality; and they may after all be the best key to life's significance, and possibly the only openers of our eyes to the deepest levels of truth.