Platitudes
Platitudes is a book written by Aristocrates and mentioned in Small Gods.
On Roundworld, a "platitude" is a proverb that has been overused to the point of becoming hackneyed or even meaningless, implying that Aristocrates' book may just be repeating things that have been said a thousand times already. The title is likely inspired by ancient philosophical works such as Poetics by Aristotle and Meditations by Marcus Aurelius.