काममया एवायं पुरुष इति सा यथाकामो भवति तत्क्रतुर भवति
यात्क्रतुर भवति तत कर्म कुरुते यत कर्म कुरुते तद अभिसम पद्यते

Kaama maya evayam purusha iti Sa Yatha kaamo bhavati tat kratur bhavati
Yat kratur bhavati tat karma kurute Yat karma kurte tad abhisam padyate

You are what your deep driving desire is, as your desire is so is your will, as your will is so is your deed, as your deed is so is your destiny.

Brihadaranyaka Upanishad (4, 4.5)