And yet if there’s one thing consistent about language it is that it is constantly changing. The only languages that do not change are those whose speakers are dead.

Rosalie Maggio (1944-2021) American writer

Unspinning the Spin: The Women’s Media Center Guide to Fair and Accurate Language, “Writing Guidelines / Introduction” (2014)
    (Source)

This is sometimes attributed to Maggio's earlier The Bias-Free Word Finder (1992), but only the first sentence is present in that version.

The source link is to the web page that the WMC set up for the book.