When rabbits are being attacked by bigger animals, they close their eyes and think, “I am not going to be killed.” But they are killed anyway. Similarly, we may deny the existence of God and the law of God, but still God and His law are there. In the high-court you may say, “I don’t care for the law of the government,” but you will be forced to accept the government law. If you deny the state law, then you will be put into prison and be caused to suffer. Similarly, you may foolishly decry the existence of God—”There is no God” or “I am God”—but nevertheless you are responsible for all your actions, both good and bad.
There are two kinds of activities—good and bad. If you act nicely and perform pious activities, then you get good fortune, and if you act sinfully, then you have to suffer.
Ref: Chapter 7c, Science of Self Realization authored by Srila Prabhupada (Founder – Acharya, ISKCON)..