H.M. Hubey wrote

> Languages take time to change. In that time period one of them will
> change much faster than others and there may be one that does not
> change at all. Stochastic behavior even allows for that.

Languages are not like that, as "entities". You are right in that
parts of languages do not change for long periods of time, and other
parts may change very rapidly. Every phoneme is free to change
almost independently of every other phoneme, and the same goes for
grammar, vocabulary and usage. To expect every "item" to be in
stasis for a period of time would be so rare as to be statistically
almost impossible - 1 chance in many hundreds of thousands if not
more. It is very similar to genomes - genomes do not stop changing,
even in species that seem to be not evolving for long periods.

Regards

John