Four Stages of Life - Verse 74-76

O excellent sages, when a portion of Krta has lapsed, then in the Treta, another age, a portion of Krta remains. When that portion has also lapsed at the advent of Treta in the beginning of Kalpa, the attainments of the remaining subjects become defunct due to efflux of time and not due to any other reason. When one attainment (Siddhi) disappears another takes its place.