How does “abundant ash” resemble an assertion supported by an indication?

Taʿrīḍ, Talwīḥ, Ramz, Īmāʾ and Ishārah; the Rhetorical Force of Figurative Speech

• Ash constitutes a formally conclusive proof of generosity
• Kināyah never intends any quality
• The word generosity is directly uttered
• A sign associated with generosity accompanies the implied claim