1 Gita Sloka Every Day - Chapter 14 - Gunatraya Vibhaga Yoga - Sloka 19

The entire content of this mail is from Swami Adidevananda's translation of Ramanuja's  Gita  Bhashya and Swami Chidbhavananda's Bhagavad Gita, both published by Ramakrishna Mission

The ways of the three gunas are now explained

Transcending the Gunas is Mukti

1 Gita Sloka  Every Day - Chapter 14 - Gunatraya Vibhaga Yoga - Sloka 19

Na anyam gunabhyah kartaram yada drushta anupashyati I

Gunebhyah cha param vedati madbhavam sah adhigachyati II sloka 19

 न अन्यं गुणभ्यः कर्तारं यदा दृष्ट अनुपश्यति I 
गुणेभ्यः च परम् वेदति मद्भावं सः अधिगच्यति II श्लोक 19

When the seer beholds no agent of action other than the gunas and knows what transcends the gunas, he attains to my state.

The seer has in the first place to totally subdue his rajas and tamas and stay in pure sattva. This is accomplished through nourishment by sattvik food and the performance of disinterested action for the propritiation of the Lord. He then perceives no agent of action other than the gunas - ie., he sees that the gunas are themselves the agents according to their nature. Further he perceives what is other than the gunas ie., perceives the gunas which are agents and the self who is not an agent of action. Such a seer attains 'my state' ie., gains likeness with me in transcending the three gunas etc. 

The purport is this: The self, pure in nature by itself, gains agency through various actions by contact with the gunas springing from past karmas. When one perceives the self in this way, namely, that the self by itself is no agent of actions and is of the nature of infinite knowledge, then it attains to my likeness.