These lectures were given by Rudolf Steiner to an audience which was
familiar with the main features of his anthroposophical teaching, and
they presume such a background of knowledge. It is therefore
inevitable that anyone unfamiliar with this background may find some
statements difficult at first reading. If he will read on he will
often find the obscurity cleared. Moreover, if he will admit the
difficult concept into his mind, and dwell quietly upon it in its
context, without either rejecting or accepting it, it will often bring
its own conviction. A list of publications is contained at the end of
this volume, any of which will help to supply a knowledge of the
fundamental principles of Anthroposophy and are of particular interest
in connection with the four lectures printed here.