kāmamaya evāyaṃ puruṣa iti
You are what your deep, driving desire is

sa yathākāmo bhavati tatkratur bhavati
As your desire is, so is your will

yatkratur bhavati tat karma kurute
As your will is, so is your deed

yat karma kurute tad abhisaṃpadyate
As your deed is, so is your destiny

-Brihadaranyakopanisad 4.4.5