Śailādi said: The three-fold[3] purity mental, verbal and physical is ordained by the path of knowledge. The preceptor shall test the disciple, ascertain his piety and virtue as well as his knowledge. He must test him to find out if he is devoid of faults-whether he is a Brahmin, a Kṣatriya or a Vaiśya. The preceptor shall whisper from ear to ear and from the knowledge shown perceive what he has known. The preceptor’s line shall thus be perpetuated duly as in the case of lamps where one lamp is lighted from another. O highly blessed one, what are called tattvas consist of the following:—Bhauvana [Bhauvanam],[4] Pada [Padam], Varṇākhya [Varṇākhyam], Mātra [Mātram], and Kālādhvara [Kālādhvaram]. Only he who cuts across these tattvas can realise Siddhi and salvation by means of his own ājñā śakti (will power) through the mercy of the preceptor.