Tamāla Kṛṣṇa: 47: "You have a right to perform your prescribed duty, but you are not entitled to the fruits of action. Neither consider yourself the cause of action, nor should you be attached to inaction (BG 2.47)." Purport: "There are three considerations here: prescribed duties, capricious work, and inaction. Prescribed duties means activities in terms of one's position in the modes of material nature. Capricious work means actions without the sanction of authority; and inaction means not performing one's prescribed duty. The Lord advised that Arjuna not be inactive, but that he be active in his duty without being attached to the result. One who is attached to the result of his work is also the cause of the action. Thus he is the enjoyer or sufferer of the result of such action. As far as prescribed duties are concerned, they can be fitted into three subdivisions: routine work, emergency work, and desired activities. Routine work in terms of the scriptural injunctions is done without desire for results. As one has to do it, obligatory work is action in the modes of goodness. Work with results becomes the cause of bondage, and so such work is not auspicious. Everyone has his proprietary right in regard to his duties, but should act without attachment to the result. Thus such disinterested obligatory duties helps to lead one to the path of liberation. Arjuna was advised by the Lord to fight as a matter of duty without attachment to the result. His nonparticipation in the battle is another side of attachment. Such attachment never leads one to the path of salvation. Any attachment, positive or negative, is cause for bondage. Inaction is sinful. Therefore fighting as a matter of duty was the only auspicious path to salvation for Arjuna." 48: "Be steadfast in your duty, O Arjuna, and abandon all attachment to success or failure. Such evenness of mind is called yoga (BG 2.48)."
Prabhupāda: This is the explanation of yoga, evenness of mind. Yoga-samatvam ucyate. If you work for Kṛṣṇa, then there is no cause of lamentation or jubilation. Jubilation is there because you are working for Kṛṣṇa, but there is no cause of lamentation. Yoga-sthaḥ kuru karmāṇi, yogaḥ karmasu kauśalam (BG 2.50). That is the secret of activities, how you can very diligently work at the same time you are not entangled with the actions. That is the secret. Go on.