From Goethe's Scientific Works, Kuerschner's Edition, Vol. 3
(1890), page XVII of the Introduction by Rudolf Steiner:
Needless to say I am not wanting to defend Goethe's Theory
of Colour in every detail. It is the underlying principle which I
would like to see maintained. Nor could it here be my task to derive
from this principle the phenomena of colour which were not yet known
in Goethe's time. I could only do justice to such a task if I were
fortunate enough one day to have the leisure and the means to write a
scientifically up-to-date Theory of Colour in Goethe's
spirit.
Fr. Vol. 1 of the same Edition (1883), page LXXXIV of the
Introduction by Rudolf Steiner:
May scientists and thinkers young in mind and in ideal
those above all who seek not only to extend the range of
information but who look deep into the central issues of our life of
knowledge pay heed to what I have set forth and follow in large
numbers, so to work out more fully and more perfectly what I have here
attempted.
From The Spiritual Guidance of Man and of Mankind by
Rudolf Steiner (1911):
In time to come there will be physicists and chemists whose
teaching will not be such as now prevails under the influence of the
Egypto-Chaldean Spirits that have remained behind, but who will teach
that Matter is built up in the way in which the Christ has gradually
ordained it. Even into the laws of Chemistry and Physics the Christ
will be found. Thus will a spiritual form of Chemistry and Physics
come to pass in future.