"One day, cock of the walk; next day, a feather duster" reflects the unpredictable nature of life and status. This phrase suggests that one moment a person can feel powerful and in control, while the next they can find themselves diminished and vulnerable. It embodies the idea of the transient nature of power and success, reminding readers that circumstances can change swiftly and without warning.

In Diana Gabaldon's "Written in My Own Heart's Blood," this concept is woven throughout the narrative, illustrating the characters' struggles with their identities and roles within a tumultuous historical context. The story captures their journey as they navigate love, loss, and the ever-shifting dynamics of their surroundings, reinforcing the notion that life is full of unexpected turns and changes in fortune.