He feels proud that he helped so many people gain their freedom.
Explanation:
According to the excerpt from The People Could Fly, the speaker feels proud about his role in the Underground Railroad that he helped so many people gain their freedom now that he is older.
He narrates how his younger grandchildren never get tired of hearing how he helped so many slaves gain their freedom and he feels a sense of pride that he was able to help so much people back when he was younger.
