The document discusses the fourth basic principle of spiritual practice according to one's spiritual level or capacity. It explains that spiritual level refers to a person's spiritual maturity or capacity, which can range from 0% for non-living things to 100% for God realization. Most people in the current era have a spiritual level between 20-35%, with only about 10,000 having reached sainthood. It recommends choosing a spiritual practice that matches one's comfort level and gradually increasing it over time, similar to progressing through school grades or stages of a relationship. Some examples of lower, middle, and higher steps in spiritual practices are given.