Final answer:
The given statement "In the book of Amos God's ultimate justice is an area of focus" is true as the book focuses on God's ultimate justice, emphasizing social justice and divine judgment.
Step-by-step explanation:
The book named after him, often referred to as the Book of Amos, pertains to his prophetic writings which emphasize that Yahweh (God) would judge both Israel and surrounding nations, underscoring that no one is exempt from moral and just expectations, regardless of their social status.
Amos was not a professional prophet but rather a shepherd and a fig-tree farmer from the Southern Kingdom of Judah who was sent to preach in the Northern Kingdom of Israel. This reflects on why it is called as a book of Amos; it is because these collected speeches and sayings have been attributed to the prophet Amos himself. His messages were particularly focused on the idea that God expects righteous behavior and that He will bring justice to those who fail to treat others fairly, including the expulsion of people from their land as a form of punishment, as suggested in the verses like Psalm 145:9 and Micah 7:2.