SB 12.3.17

yugāni — the ages of the universal history; yuga-dharmān — the special qualities of each age; ca — and; mānam — the measurement; pralaya — of annihilation; kalpayoḥ — and of universal maintenance; kālasya — of time; īśvara-rūpasya — the representation of the Personality of Godhead; gatim — the movement; viṣṇoḥ — of Lord Viṣṇu; mahā-ātmanaḥ — the Supreme Soul.