The essence, the substance, of the teachings of Judaism, needs
to be constant from one generation to the next. But the idiom, style,
manner, approach and mode of communication of that essence or that
substance, may, and for some, must, change from one generation to the
next. What was effective in the Middle Ages is not necessarily effective
in the twenty-first century; what worked well in Eastern Europe will not
necessarily work well in America. The message is the same; the medium
changes from time to time and from place to place.8
Schacter, J. J. (2010). Haazinu: Teshuvah, punishment and the leadership of Moshe (pp. 477-482). In D. Z. Feldman, & S. W. Halpern, (Eds.), Mitokh ha-ohel : essays on the weekly parashah from the rabbis and professors of Yeshiva University. Maggid Books.
*This is constructed from limited available data and may be imprecise.