The question of chief importance here, however, is equanimity and equilibrium of the soul qualities. Man is only too easily inclined, if he surrenders himself to a certain soul activity, to fall into one-sidedness. For example, if he becomes aware of the advantage of inner meditation and of dwelling in his own thought world, he may develop such an inclination toward it that he begins to shut himself off from the impressions of the outer world.
This, however, leads to the withering and devastation of the inner life. Those go the farthest who preserve, alongside the ability to withdraw inwardly, an open receptivity to all impressions of the outer world. One need not think here merely of the so-called important impressions of life, but every man in every situation — even in the poorest surroundings — may have sufficient experiences if he only keeps his mind sufficiently receptive. One need not seek the experiences; they are present everywhere.
Source: Rudolf Steiner – GA 13 – OCCULT SCIENCE: V. Cognition of the Higher Worlds – Initiation
Translated by Maud and Henry B. Monges and revised for this edition by Lisa D. Monges.