adj. 25B6; adjective
eternal happiness : EVERLASTING, never-ending, endless, perpetual, undying, immortal, abiding, permanent, enduring, infinite, boundless, timeless.
eternal vigilance : CONSTANT, continual, continuous, perpetual, persistent, sustained, unremitting, relentless, unrelieved, uninterrupted, unbroken, never-ending, non-stop, round-the-clock, endless, ceaseless.
transient, intermittent.