"For many cycles of time we have been working as individuals with the four strongest races, from one of which will be developed the people who will one day replace us as Guardians of Civilization. Blood lines have been established. We have encouraged matings which concentrate traits of strength and dissipate those of weakness. While no very great departure from the norm, either physically or mentally, will take place until after the penultimates have been allowed to meet and to mate, a definite general improvement of each race has been unavoidable. "Thus the Eddorians have already interested themselves in our budding Civilization upon the planet Tellus, and it is inevitable that they will very shortly interfere with our work upon the other three. These four young Civilizations must be allowed to fall. It is to warn every Arisian against well-meant but inconsidered action that this conference was called. We ourselves will operate through forms of flesh of no higher intelligence than, and indistinguishable from, the natives of the planets affected. No traceable connection will exist between those forms and us. No other Arisians will operate within extreme range of any one of those four planets; they will from now on be given the same status as has been so long accorded Eddore itself. The Eddorians must not learn of us until after it is too late for them to act effectively upon that knowledge. Any chance bit of information obtained by any Eddorian must be obliterated at once. It is to guard against and to negate such accidental disclosures that our Watchmen have been trained." "But if all of our Civilizations go down...." Eukonidor began to protest. "Study will show you, youth, that the general level of mind, and hence of strength, is rising," the fused Elders interrupted. "The trend is ever upward; each peak and valley being higher than its predecessor. When the indicated level has been reached--the level at which the efficient use of the Lens will become possible--we will not only allow ourselves to become known to them; we will engage them at every point."