It is important to note that there are many ways to write a thesis; while the wording "in and of itself" can be used, there are many formats that may present your idea in a stronger way. Follow the reference link below to find more information on how to build a thesis statement. Whatever format is used, a thesis statement should clearly convey the writer's position and set up the purpose for the paper.
Courage is a theme that is prevalent throughout To Kill a Mockingbird. The actions and observations of Atticus demonstrate to the reader that courage is a moral, not a physical, act. This idea could be phrased in the following way: Courage in and of itself is not a physical act, but a moral one, as is demonstrated by Atticus Finch in To Kill a Mockingbird.
Atticus's commitment to seeking justice in Tom Robinson's case is a moral act, and one that requires great courage, as many of the townspeople become hateful toward Atticus and his family. One of the difficult lessons the reader learns in To Kill a Mockingbird is that, despite his devotion to exposing the truths of the case throughout the trial, Atticus is not able to spark the change that the Finch family longs to see within the town. This lesson could also translate to a thesis statement in the following way: Courage in and of itself is not enough to change the minds of those who are ignorant.
Whichever thesis statement is chosen, it is necessary that the thesis be supported by evidence from the text.