“As a joke he would sometimes ask her, “Proud of what? I haven’t done anything.” And she’d always say, “I’m just proud that you are my son.” She wasn’t perfect or anything. She had bad days when nothing he did could make her smile, especially after she got sick.” (Paragraph 37)
Explanation:
This explains how good of a relationship Luis and his mother used to have. Luis loves his mother and wants to be able to have that back again.
Basically, the quote means that this lady has lived a long, tired, and hardworking life. Her soul is at rest because she is satisfied with the life that she lives.