Our Sages gathered these sections in an order ... according to the requisite steps (Introduction to Path of the Just).
While character refinement is an important and desirable goal, we must be careful to stride toward it in a reasonable and orderly manner. Overreaching ourselves may be counterproductive.
Physical growth is a gradual process. In fact, it is not even uniform; the first two decades are a sequence of growth spurts and latency periods. Generally, the body does not adjust well to sudden changes, even when they are favorable. For instance, obese people who lose weight too rapidly may experience a variety of unpleasant symptoms. Although the weight loss is certainly in the interest of health, the body needs time to adjust to the change.
If we are convinced, as we should be, that spirituality is desirable, we might be tempted to make radical changes in our lives. We may drop everything and set out on a crash course that we think will lead to rapid attainment of the goal. This plan is most unwise, because psychologically as well as physically, our systems need time to consume new information, digest it, and prepare ourselves for the next level.
Luzzato's monumental work on ethics, The Path of the Just, is based on a Talmudic passage which lists ten consecutive steps toward spirituality. Luzzato cautions: "A person should not desire to leap to the opposite extreme in one moment, because this will simply not succeed, but should continue bit by bit" (Chapter 15).