The "eternal light" in the synagogue is not a permanent yahrtzeit light - it is a sign of the eternal covenant between G-d and the Jews.
permanent peace
Antonyms of the word "temporary" could be permanent, perpetual, eternal, or everlasting.
eternal, forever, everlasting, permanent, ceaseless
The opposite could be temporary, interim, or brief.
forever, everlasting, permanent, enduring, endless, perpetual, timeless, unending
Eternal law is without beginning or end. It refers to us, as people, being one with ourselves and our god.
Death, like a nap, isn't permanent
Permanent streams flow all year long, whereas ephemeral streams flow only for part of the year- in fact, some ephemeral streams flow only for a brief time after a heavy rain
undying, deathless, eternal, everlasting, never-ending, endless, lasting, enduring, ceaseless; imperishable, indestructible, inextinguishable, immutable, perpetual,permanent, unfading.
Eternal - Eternal album - was created on 1999-11-08.
Opposite (or antonym) of transient could be:ceaseless,dateless,deathless,endless,enduring,eternal,everlasting,immortal,lasting,long-lived,permanent,perpetual,timeless,undying,unending