The Life we have is very great — Biography

The Life we have is very great. 1
The Life that we shall see
Surpasses it, we know, because
It is Infinity.
But when all Space has been beheld 5
And all Dominion shown
The smallest Human Heart's extent
Reduces it to none.
(F.1178/J.1162)
[1] Life:: the current way of living.
[2] Life:: a written account of a person's life; a biography (OED 13). see:: to read a book.
[3] Surpasses it:: a biography surpasses the life we have now.
[4] Infinity:: the future life is without limit.
[5, 6] Space, Dominion, has been beheld:: if someone has seen all the fields.
[7] smallest Human Heart:: and that someone has the smallest heart.
[8] none:: his biography is nothing.