Final answer:
The motivation for wanting to drive the sheik's horses is not detailed in the provided text, but in literature, motivations could range from ambition to a need for validation, depending on the story's context.
Step-by-step explanation:
The motivation for wanting to drive the sheik's horses is not explicitly stated within the provided text excerpts.
However, in general, motivations in literature could include a variety of factors such as ambition, desire for glory, a sense of duty, a need to prove oneself, or the thrill of competition.
These motivations are often contextualized within the narrative of the story, shaped by the character's background, experiences, and interactions with other characters.
In stories involving competition such as chariot racing, characters might be driven by personal challenges, loyalty to a faction or individual, or the pursuit of excellence and victory.