T. is needed in this Art chiefly on account of the ultimate universality of its principles, whereby T. serves as a subject and instrument for all sciences and a means to solve any question or objection and discover any particular in its universality as the seeker combines its triangles, forms its cameras and adduces the propositions from its cameras and reduces all the statements and cameras of the other figures to those of T. while surveying them with T., since without T. no particular truth can be discovered, nor can any question or objection be resolved without T., given that T. consists of universal principles.