In other words, if you allow yourself to try, after a while you'll no longer simply be faking it, but actually doing it.
A gentle spin on Descartes' "I think, therefore I am," with the proviso that the best writing mixes craft and openness, the willingness to play around, pretend, jam, improvise.
The same applies to living, I'd venture to say.
As it does to goodness, the saints suggest.
Aiming for the lofty, faking it if & when you must. The practice, the constant, continual practice eventually making it real.
The habit becoming us.