If the knowledge of Anthroposophy were applied in practical spheres like education, the idle talk that this knowledge has first to be proved would quickly disappear. Whoever applies it correctly, will find that the knowledge of Anthroposophy proves itself in life by making life strong and healthy. He will see it to be true in that it holds good in life and practice, and in this he will find a proof stronger than all the logical and so-called scientific arguments can afford. Spiritual truths are best recognized in their fruits and not by what is called a proof, be this ever so scientific; such proof can indeed hardly be more than logical skirmishing.
Source: Rudolf Steiner – GA 34 – The Education of the Child in the Light of Anthroposophy
Translated by George and Mary Adams