True.

Well then, can you name me a man who has tried every path in philosophy, who knows what Pythagoras, Plato, Aristotle, Chrysippus, Epicurus, and the rest, say, and, finally, has chosen one path out of them all, has proved it genuine, and has learnt by experience that it alone leads straight to happiness? If we found such a person we should stop worrying.

It would not be easy to discover such a person.