In the practical world of computing, it is rather uncommon that a program, once it performs correctly and satisfactorily, remains unchanged forever. – Niklaus Wirth
But active programming consists of the design of new programs, rather than contemplation of old programs. – Niklaus Wirth
Nevertheless, I consider OOP as an aspect of programming in the large that is, as an aspect that logically follows programming in the small and requires sound knowledge of procedural programming. – Niklaus Wirth
Clearly, programming courses should teach methods of design and construction, and the selected examples should be such that a gradual development can be nicely demonstrated. – Niklaus Wirth