The mutability of language is itself immutable, and English never stops growing and changing.
As the "Interpreter" of the title suggests, the mutability of language also plays a major role in Ulitskaya's message.
late 14c., "tendency to change, inconstancy," from Middle French mutabilité, from Latin mutabilitas, from mutabilis (see mutable).
late 14c., "liable to change," from Latin mutabilis "changeable," from mutare "to change," from PIE root *mei- "to change, go, move" (cf. Sanskrit methati "changes, alternates, joins, meets;" Avestan mitho "perverted, false;" Hittite mutai- "be changed into;" Latin meare "to go, pass," migrare "to move from one place to another;" Old Church Slavonic mite "alternately;" Czech mijim "to go by, pass by," Polish mijać "avoid;" Gothic maidjan "to change"); with derivatives referring to the exchange of goods and services as regulated by custom or law (cf. Latin mutuus "done in exchange," munus "service performed for the community, duty, work").