Because cultures and languages are constantly changing and because the apostolic testimony must be attested in ever-new circumstances, it is a necessary feature of the apostolic tradition that it both guard the original testimony and make it understandable in new culture settings. Failing either is to default on the apostolic tradition. Far from implying unbending immobility, apostolicity requires constant adaptation of the primitive apostolic testimony to new historical challenges and languages, yet without altering or diluting the primitive witness.