Sri Aurobindo
Letters of Sri Aurobindo
Volume I - Part 5
In speaking of supreme liberation [in the previous letter] I was 
simply taking the Buddhist, Adwaita view for granted and correcting it by saying that this Nirvana view is too negative. Krishna opened the possibility of Overmind with its two sides of realisation, static and dynamic. Buddha tried to shoot from mind to Nirvana in the Supreme, just as Shankara did in another way after him. Both agree in overleaping the other stages and trying to get at a nameless and featureless Absolute. Krishna on the other hand was leading by the normal course of evolution. The next normal step is not a featureless Absolute, but the Supermind. I consider that in trying to overshoot, Buddha like Shankara made a mistake, cutting away the dynamic side of the liberation. Therefore there has to be a correction by Kalki.
I was of course dealing with the Ten Avatars as a “parable of the evolution”, and only explaining the interpretation we can put on it from that point of view. It was not my own view of the thing that I was giving.