51:4.3

On those worlds having all six evolutionary races the superior peoples are the first, third, and fifth races—the red, the yellow, and the blue. The evolutionary races thus alternate in capacity for intellectual growth and spiritual development, the second, fourth, and sixth being somewhat less endowed. These secondary races are the peoples that are missing on certain worlds; they are the ones that have been exterminated on many others. It is a misfortune on Urantia that you so largely lost your superior blue men, except as they persist in your amalgamated “white race.” The loss of your orange and green stocks is not of such serious concern.