Long ago, there was a root that mostly meant vital force, or life. We modern English speakers no longer have that word, but we have its grandchildren.
One of them made its way through Greek & Latin to become eon, an indefinitely long period of time.
Another came through Old English to become the word each, meaning any, all, every. So did ever, meaning at any time, & every, meaning each individual without exception. This root also gave us the word never, meaning not ever, & never’s Old English synonym, no.
Making its way through Latin & Old French, this root grew into eternal, meaning enduring, everlasting, endless, as did the word eternity, meaning forever.
It also came through Greek & French to become hygiene, the healthful art.
Its Latin progeny include longevity, meaning great age or long life, & primeval, or first age.
Another came to English through Sanskrit to become Ayurvedic, pertaining to the traditional Hindu science of medicine.
Through a Scandinavian source, this word became nay, meaning not ever.
Who knew? Vital forces, indeed.