Beginnings are always difficult. Wherever one starts, there is always the question: What was before that? This question comes from our sense of objective causality - that everything must be preceded by its cause.
Must everything have a cause? If "no," then one leaps immeadiately to invoking mystical beginnings. If "yes," then the beginning is a logical impossibility. There can, by definition, be no beginning if everything must have a cause.
By the logic of causality, beginnings are illogical. The logic of causality requires ( because we DO exist ) the intial existence from which we are derived to erupt spontaneously from nothing.
Clearly, the notion of objective causality must violate its own logic in order to get started.
The other alternative, there is no beginning, existence is somehow infinite and perpetual, is itself a mystical assertion that comes from nowhere and goes nowhere. Such an unbounded mysticism offers its supporters no possibility of either answers or clues.
From the theory of everything.
Blueblades, just keeping it simple.