Answer:
Mrs. Jones wants indeed to teach Roger a lesson about trust.
Step-by-step explanation:
Mrs. Luella Jones and Roger are characters in the short story "Thank You, Ma'am", by Langston Hughes. Roger is a poor teenager who wishes to buy himself a new pair of shoes. Being neglected at home, he has no one to take care of him or to worry about his actions. He seems to have no mentors in life. Roger is not successful at stealing from Mrs. Jones. She is a large woman - body and heart - who catches and drags him to her house. After forcing him to wash his face, she decides to cook him some dinner.
Mrs. Jones has also had a tough life. She understands what Roger is going through, and even admits to having done things she isn't proud of. That's why it isn't hard for her to empathize and try to teach him a lesson through love. She shows him she trusts him by leaving her purse unattended and the door open. Roger could simply take the purse and run away, but he doesn't. This is probably the very first time in a very long time that someone trusts him. He chooses to behave, and ends up rewarded with some money for the sneakers. When he leaves the house, he wishes he could express his immense gratitude to that incredible woman, but is only able to say thank you.