We act according to our whims, and the resultant action is there immediately. The nature’s law, God’s law, is there. We have got experience that if we infect some disease, contaminous disease, then we must suffer from that disease. So it is not God’s creation that somebody is suffering from some painful condition and somebody is enjoying. No. We infect ourself with some contamination because this world, this material world, is full of contamination, full of contamination. Just like when there is epidemic, the whole situation is contaminous. Therefore one has to take vaccine injection to protect himself. So anyone who has come to this material world must know that he has come in a place which is a place of epidemic. So you must have to remain very cautious. Otherwise you will have to suffer.

From Srila Prabhupada’s lecture on Srimad-Bhagavatam 7.9.41 — 19 March, 1976