1. It is said that a prayer is in ACTIVE VOICE when the significance of the verb is produced by the grammatical person to whom that one refers:



Pedro of Mendoza founded Buenos Aires.


(Pedro of Mendoza founded Buenos Aires).


2. It is said that a prayer is in PASSIVE VOICE when the significance of the verb is got by the grammatical person to whom that one refers:


Buenos Aires was founded by Pedro of Mendoza.


(Buenos Aires was founded by Pedro of Mendoza).