ὁ δρῶν

From LSJ

τὸ μὲν εὖ πράσσειν ἀκόρεστον ἔφυ πᾶσι βροτοῖσιν → all mortals have by nature an insatiable appetite for success, our mortal state with bliss is never satiate, success is something for which humanity is insatiatable

Source

Greek > English (Woodhouse)

he who acts

Spanish

el que actúa, el oficiante