The best example of nirvana is cited in Bhagavad-gita. In the beginning the mind of Arjuna deviated from Krsnas. Krsna wanted Arjuna to fight, but Arjuna did not want to, so there was disagreement. But after hearing Bhagavad-gita from the Supreme Personality of Godhead, Arjuna dovetailed his mind with Krsnas desire. This is called oneness. This oneness, however, did not cause Arjuna and Krsna to lose their individualities. The Mayavadi philosophers cannot understand this. They think that oneness necessitates loss of individuality. Actually, however, we find in Bhagavad-gita that individuality is not lost. When the mind is completely purified in love of Godhead, the mind becomes the mind of the Supreme Personality of Godhead. The mind at that time does not act separately, nor does it act without inspiration to fulfill the desire of the Lord. The individual liberated soul has no other activity. pratinivrtta-guna-pravahah. In the conditioned state the mind is always engaged in activity impelled by the three modes of the material world, but in the transcendental stage, the material modes cannot disturb the mind of the devotee. The devotee has no other concern than to satisfy the desires of the Lord. That is the highest stage of perfection, called nirvana or nirvana-mukti. At this stage the mind becomes completely free from material desire.

Yatharcih. Arcih means flame. When a lamp is broken or the oil is finished, we see that the flame of the lamp goes out. But according to scientific understanding, the flame is not extinguished; it is conserved. This is conservation of energy. Similarly, when the mind stops functioning on the material platform, it is conserved in the activities of the Supreme Lord. The Mayavadi philosophers conception of cessation of the functions of the mind is explained here: cessation of the mental functions means cessation of activities conducted under the influence of the three modes of material nature.