Rough translation is: Do not believe in yourself, - Arkady said.
You'll be disappointed, $#@...
Better believe in God and aliens.
Do not count on more than that.
In general, it is a joke and is very difficult to translate. So the translation is for reference only.
The main character (the one with glasses) - an intellectual and an agnostic, a very famous man in Russia... at least online . Here he is.