We have to realise that we must repeat in all possible forms to our age and to the age which is coming — but not rashly, fanatically or by agitation — what the principles and essence of Spiritual Science are, until it has sunk in. It is just the characteristic trait of our time, that Ahriman has made skulls very hard and dense and that they may be softened again only slowly. So no one, I would say, must draw back in fear and trembling from the necessity to emphasise in all possible forms what is the being and the impulse of Spiritual Science.
Source: Rudolf Steiner – GA 162 – Intervals of the Life on Earth – Dornach, 30th May 1915
Translated by David MacGregor