Based on Bhagavad Gita Chapter 16, Text 17
The Bhagavad-gita (16.17) describes the godless to be self-complacent and impudent (atma-sambhavitahstabdah). They throw morality and spirituality to the winds for the sake of pursuing self-centered pleasures. To further their egocentric ends, they create a façade of being know-all and do-all; of knowing all that matters and being able to do all that matters. Their external self-assuredness may impress us; we may even feel tempted to become like them.
Gita wisdom helps us see through the façade by showing how the godless, despite their aggressive posturing, are doing nothing new. They are playing the oldest game that there is to play: playing god. And they will meet, sooner or later, the same old result that all such imitator gods have met: frustration, devastation and destruction. They will be frustrated on being outclassed by others; devastated on being defeated repeatedly; and destroyed when death ends their egomania permanently. The sixteenth chapter of the Gita explains that even at present while they flaunt their glory externally they are internally tortured by the innumerable and insatiable desires that burn within their mind and senses.