Where to beegin

Every end is a beginning,every beginning is an end
One follows the other,or does it lead
One within the other,or is it without
Or all of these at once manifest
A timeless dance, eternal quest
Different in name,akin they portend
Death seeking life,start seeking end
Can we really know, at what threshold we stand
At that of a first,or that of a last?
And in this unending circle, if you would like to know me;
My friend,where will you begin?