Seems im gonna have to make it very simple for you
And
all things (that is everything in the universe, matter as i said before, if God meant life he would say so but he says ALL THINGS i.e. matter that is in everything)
We (Allah)
have created by pairs, (i.e. "all things" are in pairs, matter anti matter, quarks anti quraks etc, they are the foundations of the universe, of which all things are made!)
that haply ye may reflect.