Sutra:
120. dhvyaththukku adhikAri Akinjcanyamum ananyagathiththvamum udaiyavan.

Meaning:
Who is the person who is qualified to recite the Dvaya rahasya mantra? One who has the quality of Akinjcanyam, which is having no other means (than Him); and the quality of ananyagatitvam, which is not seeking anyone but Him for protection.

Sri PBA Swami's Sarartha Deepikai:
It is difficult to find those who are qualified to recite the Dvaya mantra which shows the means to the goal. The qualified are those who have the qualities of Akinjcanyam and ananyagatitvam. Akinjcanyam is having no means in one's hand to gain the goal, as in Azhvar's "nORRa nOnbilEn nuNNaRivilEn". ananyagatitvam is not even thinking of anyone but Him for protection, as in Azhvar's "pugal onRillA adiyEn" and "kaLaikaN maRRilEn".