The next stage, which is the stage of assimilation, is most necessary, and very few can imagine how long it takes for the spirit to assimilate knowledge of truth. One assimilates it by the power of contemplation. It is by pondering over the subjects that one has heard, by practicing the teachings in one's life, by looking at the world from the point of view which one has been taught, by observing one thing in its thousand different aspects, that one assimilates.