[472] Gardens, farms and thickets that are on elevated ground are more fertile than lower placed ones due to the fact that their rich soil mostly remains intact, not being depleted or swept away by running water or streams; such gardens are also more exposed to the wind which results in easier pollination and are much more exposed to the sun, the source of light. This is the analogy God draws of the charity of the sincere. No matter how much it is, it grows and prospers. (al-Ṭabarī, Ibn Kathīr, al-Saʿdī)