Every genuine knowledge is born out of sorrow, of suffering, of grief. True, profound knowledge is never born out of joy. True, profound knowledge is born out of suffering.
Source: Rudolf Steiner – GA 226 – Man’s Being, His Destiny and World Evolution: Lecture 5 – Kristiania, 20th May 1923
Translated by Erna McArthur
The great Rudolf Steiner Quotes Site 