Allan Bloom in Closing of the American Mind says as per the title, but shows its deeper roots as being from the ambiguity of what is the ''self''. His solution is more or less along the lines of what you would call classical education. [HE especially recommends The Republic of PLATO.

[I am not clear as to the reason for The Republic since to my mind, the shorter dialogues seem a lot more powerful. But that might just be because of my short attention span. I tend to have the same sort of preference in music for short and to the point rather than long build ups.]

That book Closing of the American Mind is a definite masterpiece, In particular his analysis of the whole problem.--and his solution.

[Even though Aristotle is also great but for what Allan Bloom is aiming at,,- the opening of the American mind,- I agree that nothing could compare to Plato.