And these people in whom the psychic powers were less shown, and in whom the less valued intellectual power was germinating, on lines more fitted for the development in future, they were chosen out for the building of the Fifth Race, and carried away from their Fourth Race surroundings into the far-off land of their education.

There of course they remained until the time came when the Manu incarnated amongst them--and so on.
That is old history on which I need not dwell.
Let us apply those same principles to the choosing out of another Root-Race, and we shall see that just as then, for the fifth Root-Race, the manasic principle was selected, so in the choosing out for a Sixth Root-Race, the buddhic principle must be the one which must be sought for in order that the material may be shaped in which it will be possible for it in its turn to develop.

There again I must remind you that the buddhi of the Sixth Root-Race in this Round will be something very different from the evolution of the pure buddhic principle in its own Round, the Round that belongs to it in the future evolution of humanity: it will be buddhic contaminated with kama, showing out much of the kamic characteristics--inevitably, inasmuch as it must work in kamic matter.

Hence you must not take quite your ideal buddhi, such as you may fancy it in its perfection--the magnificent principle of Pure Reason, in its higher intuitive power--but a shadow, a reflexion of it, such a shadow and reflexion as is able to take its veils, its garments, from the matter of our own Round.

None the less, that will be the distinguishing, the dominant principle of the Sixth Root-Race, and therefore I ask you to fix your mind on that as the goal towards which all roads in the present should tend.