When man begins from out of the world of Imagination to light up his sleep consciousness, when he begins to lighten it with knowledge and experiences, then it is important for him to make sure that he himself gets out of the way and so shuts out of his consciousness all that might cause disturbance to his physical and etheric bodies.
It is an absolute necessity, in making the ascent into higher worlds to get to know oneself thoroughly and exactly. When we really know ourselves we cease as rule to love ourselves. Self-love comes to an end when we begin to have self-knowledge; and this self-love — which is always present in a man who has not attained to self-knowledge, for it is an illusion to imagine we do not love ourselves; we love ourselves more than anything else in the world — this self-love must have been overcome if we are to be able to shut ourselves out of our consciousness.
We must, in actual fact, come to the point where we say to ourselves: As I am now, I must eliminate myself. We have already gone a long way in this direction in that we have attained to self-surrender. But we must now not love ourselves at all. We must have the possibility at every moment to feel — I must put myself right on one side; for if I do not shut out completely all those things in me that otherwise I quite like to feel in me, errors, trivialities, prejudices sympathies, antipathies — if I do not put these right away then my ascent into higher worlds cannot be made aright.
Source: Rudolf Steiner – GA 134 – THE WORLD OF THE SENSES AND THE WORLD OF THE SPIRIT – Lecture II – Hannover, 28 December 1911