He is known only to the prophets in particular, so praise be to God who bestowed upon us the knowledge of him. We have not seen that except because God has graciously granted us complete respect for His messengers, peace be upon him, and His revealed laws, and the knowledge of righteousness is specific to them. So God has enabled me to reap its fruit. I have alerted you to the path that leads to the knowledge of righteousness, the path of which people have overlooked and made use of. In the fourth layer, they took the path as a straight line, but the path of truth is not like that, but rather it is straight and round, for the people are ignorant of the meaning of straightness in things, what it is, so straightness in a circle is to be a correct circle such that every line emerging from the point to the perimeter of it is equal to its companion and the rest of the lines, just as straightness is in shape. The square and the triangle are to have equal sides with equal angles, just as