Would it sounds strange to our time, it is true, that people who lie a lot, for example wounds – under otherwise identical conditions – are more difficult to cure than with honest people. Obviously one can not absolutely conclude this, there may also be other reasons. However, provided that all the other conditions are the same, then in people lying wounds to heal more difficult than in truth-humans.
Source (German): Rudolf Steiner – GA 125 – Wege und Ziele des geistigen Menschen – Munich, 11 December 1910 (page 209)
This English translation has been copied from the book: GA 125 – Paths and Goals of the Spiritual Human Being – Life questions in the light of spiritual science – Munich, 11 December 1910