Brihadaranyaka Upanishad 4.40

तद्यथाकारी यथाचारी तथा भवति साधुकारी साधुर्भवति पापकारी पापो भवति पुण्यः पुण्येन कर्मणा भवति पापः पापेन अथो खल्वाहुः काममय एवायं पुरुष इति स यथाकामो भवति तत्क्रतुर्भवति यत्क्रतुर्भवति तत्कर्म कुरुते यत्कर्म कुरुते तदभिसम्पद्यते ॥

tad yathaakaaree yathaachaaree tathaa bhavati saadhukaaree saadhur bhavati paapakaaree paapo bhavati punyah punyena karmanaa bhavati paapah paapena atho khalvaahuh kaamamaya evaayam purusha iti sa yathaakaamo bhavati tatkratur bhavati yatkratur bhavati tatkarma kurute yatkarma kurute tadabhisampadyate

As one acts, as one behaves, so does one become. The doer of good becomes good; the doer of evil becomes evil. One becomes virtuous by virtuous action, evil by evil action. Others say: this person is made of desire alone. As is his desire, so is his resolve; as is his resolve, so is the action he performs; and as is his action, so is what he attains.

जैसा करता है, जैसा आचरण करता है — वैसा ही हो जाता है। साधु कर्म करने वाला साधु, पाप कर्म करने वाला पापी; पुण्य कर्म से पुण्यवान्, पाप कर्म से पापी होता है। और कुछ कहते हैं — 'यह पुरुष काममय ही है।' जैसी उसकी कामना, वैसा ही उसका संकल्प; जैसा संकल्प, वैसा ही कर्म; और जैसा कर्म, वैसा ही फल वह प्राप्त करता है।