妙法蓮華經玄贊 1.44

1.44

There are four reasons: First, because conventional discourse is made easy; if one were to say "non-self," which applies generally across the aggregates, bases, and elements, who would be known as speaking this? Second, because it accords with worldly convention. Third, because it removes the fear of non-self; if one says "non-self," for whose sake would one cultivate and study? Fourth, because there are self and other, defilement and purity, cause and effect, activities, and so forth; therefore he says "I."