Final answer:
The claim is false; the Ordinary of the Mass consists of parts that remain the same in each service. The Proper includes the texts that change for each service.
Step-by-step explanation:
The texts of the Mass that change from service to service are known as the Proper, not the Ordinary. The Ordinary of the Mass refers to the parts that remain the same in each service. So the statement mentioned is false. The Ordinary includes texts such as the Kyrie, Gloria, Credo, Sanctus, and Agnus Dei, which are standard in many Masses. On the other hand, the Proper includes texts that change daily with the liturgical calendar, such as the Collect, the Epistle, the Gospel, the Secret, the Communion, and the Postcommunion.