yōgasthaḥ kuru karmāṇi saṅgaṅ tyaktvā dhanañjaya.
siddhyasiddhyōḥ samō bhūtvā samatvaṅ yōga ucyatē৷৷2.48৷৷
श्रीमद् भगवद्गीता
मूल श्लोकः
English Commentary by Swami Sivananda
2.48 yōgasthaḥ steadfast in Yoga, kuru perform, karmāṇi actions, saṅgam attachment, tyaktvā having abandoned, dhanañjaya O Dhananjaya, siddhyasiddhyōḥ in success and failure, samaḥ the smae, bhūtvā having become, samatvam evenness of mind, yōgaḥ Yoga, ucyatē is called.
Commentary:
Dwelling in union with the Divine perform actions merely for God's sake with a balanced mind in success and failure. Eilibrium is Yoga. The attainment of the knowledge of the Self through purity of heart obtained by doing actions without expectation of fruits is success (Siddhi). Failure is the non-attainment of knowledge by doing actions with expectation of fruit. (Cf.III.9;IV.14;IV.20).