49:5.15

While the terrestrial attainments of the one-brained races are slightly limited in comparison with the two-brained orders, the older planets of the three-brained group exhibit civilizations that would astound Urantians, and which would somewhat shame yours by comparison. In mechanical development and material civilization, even in intellectual progress, the two-brained mortal worlds are able to equal the three-brained spheres. But in the higher control of mind and development of intellectual and spiritual reciprocation, you are somewhat inferior.