Who soliloquizes "The path to my fixed purpose is laid with iron rails, whereon my soul is grooved to run" (4)

I believe the answer is:

ahab

(Other definitions for ahab that I've seen before include "Captain hunting the whale Moby-Dick" , "Captain -, pursuer of Moby Dick" , "Melville's Captain" , "One whose nemesis was white" , "Whaling Captain" .)

I've seen this clue in The New York Times.

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