As a wheel sometimes goes up and sometimes comes down, the stringent laws of material nature make the living entity in material existence sometimes happy and sometimes distressed

Expressions researched:
"As a wheel sometimes goes up and sometimes comes down, the stringent laws of material nature make the living entity in material existence sometimes happy and sometimes distressed"

SB Canto 7

As a wheel sometimes goes up and sometimes comes down, the stringent laws of material nature make the living entity in material existence sometimes happy and sometimes distressed.

SB 7.13.30, Purport:

Yajñārthāt karmaṇo 'nyatra loko 'yaṁ karma-bandhanaḥ: (BG 3.9)) if one does not act for the satisfaction of Kṛṣṇa, who is known as Viṣṇu or Yajña, he must be entangled in the reactions of fruitive activities. These reactions are called pāpa and puṇya—sinful and pious. By pious activities one is elevated to the higher planetary systems, and by impious activities one is degraded to lower species of life, in which he is punished by the laws of nature. In the lower species of life there is an evolutionary process, and when the term of the living entity's imprisonment or punishment in the lower species is finished, he is again offered a human form and given a chance to decide for himself which way he should plan. If he again misses the opportunity, he is again put into the cycle of birth and death, going sometimes higher and sometimes lower, turning on the saṁsāra-cakra, the wheel of material existence. As a wheel sometimes goes up and sometimes comes down, the stringent laws of material nature make the living entity in material existence sometimes happy and sometimes distressed. How he suffers in the cycle of happiness and distress is described in the next verse.