 Tajriba does appear in the passage just cited, but it is not mentioned at all in the shorter pietistic treatise, Ithbāt al-mabdaʾ (Establishing the First Principle). On the other hand, Ibn Kammuna does employ in the shorter work several cognate terms to describe the person who can grasp a certain fact immediately and without the need for lengthy demonstration: dhihn salim (“healthy mind,” Pourjavady &amp; Schmidtke 2006, 188), dhu fitana (“clever,” Pourjavady &amp; Schmidtke 2006, 189), dhu lubb (“understanding,” Pourjavady &amp; Schmidtke 2006, 189).