The remarkable thing is this; that substances that can make a man ill or even kill him, can also cure him. This is one of the great responsibilities one has in the preparation of medicines, for there are no real remedies which, if wrongly applied, cannot cause the same illnesses which they can also cure.
Source: Rudolf Steiner – GA 351 – Nine Lectures on Bees: Lecture VII – Dornach, December 12, 1923
Translated by Marna Pease & Carl Alexander Mier
The great Rudolf Steiner Quotes Site 