Bhagavad Gita Verse 2.48
योगस्थः कुरु कर्माणि सङ्गं त्यक्त्वा धनंजय । सिद्ध्यसिद्ध्योः समो भूत्वा समत्वं योग उच्यते ॥ २.४८ ॥
हे धनंजय! तू आसक्ति को त्यागकर तथा सिद्धि और असिद्धि में समान बुद्धिवाला होकर योग में स्थित हुआ कर्तव्य कर्मों को कर, समत्व (जो कुछ भी कर्म किया जाए, उसके पूर्ण होने और न होने में तथा उसके फल में समभाव रहने का नाम ‘समत्व’ है।) ही योग कहलाता है|
The Divine Lord said: O ARJUNA, perform all your actions with an even mind. In other words, do not feel overjoyed at the successes in your life and do not allow yourself to feel overcome with grief because of any failures you may encounter on life. Rid yourself of any attachments to material things and always remember that the results of your actions is in the Lord’s hands. If you react the same way, regardless of the result of your actions, you are performing what is known as KARMYOGA.