On our earth and probably on a number of other planets, conditions favoured the production of more complex chemical compounds, culminating in
substances, capable of self-reproduction and self-variation, and therefore subject to a new mechanism of change - natural selection. The passing of
this critical point initiated the biological or organic phase of evolution...
Eventually, in the line leading to man, the organization of awareness reached a level at which experience could be not only stored in the individual
but transmitted cumulatively to later generations. This second critical point initiated the human or psychosocial phase of evolution... its tempo is
not only much faster than that of biological evolution, but manifests a new phenomenon, in the shape of a marked acceleration...
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