Not a cosmic matter singularity, but the cosmic vacuum pressure caused the primordial “Big-Bang”!

How to speak about the whole universe?Everything in the universe originates with the Big-Bang!, -is said all around.But people saying so up to now even do not know, how this Big-Bang could ever physically have been caused at all, and how especially mankind could ever, if at all, have escaped from this life-threatening, early cosmic catastrophe?Though perhaps this seems to be a prime question to mankind, an even major, more aprioristic question before still may be, how to think and to speak over the "whole universe" in logically convincing terms?What kind of conception do we in fact need to have for a subject which is addressed as such: the breathtaking vastness of the infinite cosmos?