Any of the Musar books of ethics and morality makes sense to learn for many reasons. One reason is that after the Middle Ages thinking in philosophy and or religious matters lost rigorous logic. That is,- even if the axioms that are assumed in the Middle Ages you might question, but almost always the results are exact. After the Middle Ages thinking in philosophy became mostly circular. Even by people you would have thought would be above that kind of mistake like John Locke or Kant.

The circular reasoning in Kant and Locke was pointed out by Dr. Kelley Ross. That is why he adopted the more rigorous approach of Leonard Nelson.