|Wanderer above the Sea of Fog, Caspar David Friedrich (1818)|
A man said to the universe:
"Sir I exist!"
"However," replied the universe,
"The fact has not created in me
A sense of obligation."
Stephen Crane (1871-1900)
If William Blake had been an existentialist he might have produced the poems of Stephen Crane.
By the way, The Red Badge of Courage is worth re-reading as an adult, even if they tried to ruin it for you in 7th grade English.
Take an hour right now and read Crane's short story, The Open Boat, which he wrote after having survived a shipwreck.