Energeia
ἐνέργειαen-ERG-ay-ah
The state of being at work, actuality, or the full realization of potential. In Aristotle's metaphysics, energeia is the complement to dynamis—where dynamis is the power to become, energeia is the becoming itself made actual. The oak tree is the energeia of the acorn's dynamis.
Modern Application
Excellence isn't a destination you arrive at but a state of active realization. Your potential means nothing until you actualize it through deliberate effort. Stop treating capability as something you possess and start treating it as something you perform. The gap between who you could be and who you are closes only through energeia—the sustained work of making the possible actual.