They don't -_- that saying is whack
Do they? I hardly think so.
Never did like that saying.
For creatures who fulfill their vocation in time, change is a law of our being.
And change actuates potency---we become more of what we are.
(I can actually make a case for the saying, but I would have to go about 3 levels deep for it to make sense.
And that is counterproductive for a saying that intends itself to be an aphorism.)