Instruction on the Viṣaya is According to the Adhikārī
Let us first look at the theme of the work and the qualification to study it. Each of these decides the other. The story of puṇyakoṭi befits a six year old. A study of the Raghu-vaṁśa, however, is for a student aged sixteen or more.
Thus each one decides the other. The one who is capable of dealing with the viṣaya—subject of the work—is the adhikārī. The instruction has to be tailored to the education and capacity of the seeker. Both of these are thus relative to each other.