Mud nourishes, fire consumes

...but the girl in her (Daenerys) still yearned for poetry, passion, and laughter. She wants fire, and Dorne sent her mud.

You could make a poultice out of mud to cool a fever. You could plant seeds in mud and grow a crop to feed your children. Mud would nourish you, where fire would only consume you, but fools and children and young girls would choose fire every time.

~ Barristan Selmy (Pg. 290)