If the red slayer think he slays,
Or if the slain think he is slain,
They know not well the subtle ways
I keep, and pass, and turn again.
Far or forgot to me is near;
Shadow and sunlight are the same;
The vanished gods to me appear;
And one to me are shame and fame.
They reckon ill who leave me out;
When me they fly, I am the wings;
Brahma is also timeless; to him, something too far into the past to remember is just occurring, and something in the future is also happening. 
 There are a couple different ways of looking at this. Catholicism puts God in a similar situation, called “The Eternal Now”; if you read mathematical mysticism (drawn from mathematics, Descartes. and eastern philosophy), you may consider this a seventh dimension, in which Brahma (and to a degree Emerson and all of us, as since Brahma touches all of us, we all are part of Brahma) is part of all time but at the same time not part of any of it. 
 A lot of this is pulling from an Advaita Vedanta idea called “Non-Self”, something drawn upon by countless others (Emerson called it the “oversoul”), in which everyone is part of a universal font of spiritual power, all times and peoples coexisting, drawing on each other’s energy.