Please explain the different ages of universal history, the special qualities of each age, the duration of cosmic maintenance and destruction, and the movement of time, which is the direct representation of the Supreme Soul, the Personality of Godhead, Lord Viṣṇu.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
युगानि युगधर्मांश्च मानं प्रलयकल्पयोः । कालस्येश्वररूपस्य गतिं विष्णोर्महात्मनः
yugāni yugadharmāṃśca mānaṃ pralayakalpayoḥ | kālasyeśvararūpasya gatiṃ viṣṇormahātmanaḥ
SB 12.3.17