That's "Childe Roland to the Dark Tower Came" by Robert Browning. The lines you're thinking of are these:
For mark! no sooner was I fairly found Pledged to the plain, after a pace or two, Than, pausing to throw backward a last view O'er the safe road, 'twas gone; grey plain all round: Nothing but plain to the horizon's bound. I might go on; nought else remained to do.
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branchandroot
Re: The path poem
Date: 2023-08-07 05:05 am (UTC)For mark! no sooner was I fairly found
Pledged to the plain, after a pace or two,
Than, pausing to throw backward a last view
O'er the safe road, 'twas gone; grey plain all round:
Nothing but plain to the horizon's bound.
I might go on; nought else remained to do.
The rest of the poem:
https://allpoetry.com/Childe-Roland-To-The-Dark-Tower-Came