In a well organized essay, analyze the language and rhetorical devices the narrator uses to convey his attitude toward Hester and toward women in general

Thesis
The narrator conveys his attitude towards Hester through descriptions of her during her isolation. Based on his observations of Hester, the narrator then makes a generalization that women become oppresses because of their over reliance on emotions.

Or should it be this

The narrator conveys that women and Hester are powerful and strong and this can be seen through the use of rhetorical devices and language.

Which one is better? Can you help me make it a really good thesis statement?

The second statement is much better.

I'd reword it something like this:

Through the use of rhetorical devices and language, the narrator conveys that women and Hester are powerful and strong.

Both thesis statements have potential, but it depends on the specific evidence and analysis you plan to include in your essay. Here's a suggestion for a revised thesis statement that combines elements from both statements:

"In [novel/passage], the narrator employs various rhetorical devices and descriptive language to convey a complex attitude toward Hester, suggesting both her strength and resilience during her isolation as well as a broader critique of societal oppression faced by women. By examining the narrator's observations and generalizations, this essay will analyze the nuanced portrayal of women and Hester, exploring the intersections of power, emotions, and societal expectations."

This revised thesis captures the idea of exploring the narrator's attitude toward Hester while also considering the broader societal context. It invites an analysis of the narrator's language, rhetorical devices, and their impact on the portrayal of women. Remember to tailor the thesis statement to the specific text you're analyzing and customize it further as you develop your essay.