Which pair of lines from Emily Dickinson's "Because I could not stop for Death" is an example of paradox?

Because I could not stop for Death
by Emily Dickinson
Because I could not stop for Death -
He kindly stopped for me -
The Carriage held but just Ourselves -
And Immortality
We slowly drove - He knew no haste
And I had put away
My labor and my leisure too,
For His Civility
We passed the School, where Children strove
At Recess - in the Ring -
We passed the fields of Gazing Grain -
We passed the Setting Sun
Or rather - He passed Us -
The Dews drew quivering and Chill -
For only Gossamer, my Gown
My Tippet - only Tulle -
We paused before a Fouse that seemed
A Swelling Ground -
The Roof was scarcely visible -
The Cornice - but a Mound -
Since then- tis Centuries - and yet
Feels shorter than the Day
I first surmised the Horses' Heads
Were toward Eternity -

A paradox is a self-contradictory statement to one's investigation that was found true. So an example would be save money by spending it. This is not the same as saving money TO spend it, because you're doing it for a reason. Saving money by spending would mean that you're not actually saving money, therefore you contradict yourself.

I chose these lines because they author is basically saying that it's been centuries since then, but it actually feels like it's been a shorter period.