This allegory in Sanai's Hadiqat al-Haqiqah illustrates the hierarchy of knowledge and action by comparing the engineer (architect), the builder, the apprentice, and the laborer. It explains that the engineer's intellectual and spiritual understanding ('knowing with the soul') is far superior to the laborer's physical exertion ('doing with the body'), which is reflected in their respective rewards and joys. Ultimately, the allegory emphasizes that true knowledge is an internal, spiritual attribute rather than mere physical labor.