Having enjoyed the wide world of heavenly sense pleasures they return to the mortal world upon exhaustion of their good Karma.
Sages speak of the immutable Tree of Life, with its tape root above and its branches below.
O Krishna, the stillness of divine union which you describe is beyond my comprehension. How can the mind, which is so restless, attain lasting peace? Krishna, the mind is restless, turbulent, powerful, violent; trying to control it is like trying to tame the wind.