sri-bhagavan uvaca

yoga adhyatmikah pumsam

 mato nihsreyasaya me

atyantoparatir yatra

 duhkhasya ca sukhasya ca

 

Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 

 

The Personality of Godhead answered: The yoga system which relates to the Lord and the individual soul, which is meant for the ultimate benefit of the living entity, and which causes detachment from all happiness and distress in the material world, is the highest yoga system.

 

Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 

 

In the material world, everyone is trying to get some material happiness, but as soon as we get some material happiness, there is also material distress. In the material world one cannot have unadulterated happiness. Any kind of happiness one has is contaminated by distress also. For example, if we want to drink milk then we have to bother to maintain a cow and keep her fit to supply milk. Drinking milk is very nice; it is also pleasure. But for the sake of drinking milk one has to accept so much trouble. The yoga system, as here stated by the Lord, is meant to end all material happiness and material distress. The best yoga, as taught in Bhagavad-gita by Krsna, is bhakti-yoga. It is also mentioned in the Gita that one should try to be tolerant and not be disturbed by material happiness or distress. Of course, one may say that he is not disturbed by material happiness, but he does not know that just after one enjoys so-called material happiness, material distress will follow. This is the law of the material world. Lord Kapila states that the yoga system is the science of the spirit. One practices yoga in order to attain perfection on the spiritual platform. There is no question of material happiness or distress. It is transcendental. Lord Kapila will eventually explain how it is transcendental, but the preliminary introduction is given here.