The word pistis is derived from the verb peithô, which in its active voice means to persuade and in its middle voice to trust in someone, to esteem him as worthy of trust, to place confidence in him, to obey.
Izan ere, pistis berba, peitho aditzetik dator, boz aktiboan komentzierazi esan nahi badu ere, erdikoan norbaitez fidatu, kasu egitea, haren pentzutan egon, obeditu adierazten duena.