I need a strong thesis!
In order to write one, you need a good
basis for comparison.
I want to write something on how their challenges such as; sexism and the abuse led by it causes them to gain inner strength.
This seems like your basis for comparison is the way both show how inner strength results from struggle. That is good!!
But usually you need to show differences as well-- is that the case here?
If your basis for comparison is the point about adversity building strength, what will be your basis for contrast? What is different about them?
Find some quotations from each book that pertain to inner strength from adversity.
:-)