Question

yes sir. papa rubbed his moustache and looked up at the trees standing like sentinels on the edge of the hollow, listening. but the way i see it, the bible didnt mean for you to be no fool. now one day, maybe i can forgive john andersen for what he done to these trees, but i aint gonna forget it. i figure forgiving is not letting something nag at you - rotting you out. now if i hadnt done what i done, then i couldntve forgiven myself, and thats the truth of it. i nodded gravely and he looked down at me. youre a lot like me, cassie girl, but you got yourself a bad temper like your uncle hammer. that temper can get you in trouble. yes sir. from mildred d. taylor, roll of thunder, hear my cry. copyright 1976 by mildred d. taylor. why is papa warning cassie? he is worried that her forgiveness will be taken advantage of. he is worried that she will appear foolish because she is young. he is worried that her temper is going to cause problems.

Explanation:

Papa explicitly mentions that Cassie has a bad temper like Uncle Hammer and that this temper can get her in trouble.

Answer:

He is worried that her temper is going to cause problems.