Let’s take a closer look at esoteric life. We know that various changes take place in our soul life through the exercises we received. For instance, the passions that a man had before get stronger. Old inclinations, drives and passions one thought one had overcome and put aside reemerge from the dark shafts of soul life and assert themselves vehemently. Or an esoteric often thoughtlessly does something which he would have been ashamed of before the start of his esoteric training or wouldn’t have done at all. His antipathies and sympathies for people become stronger than before; his whole soul life becomes stirred up. In short, a man gets to know what he’s really like in his soul depths so that he has real self-knowledge. Therefore strict and strong self-control is indispensable for an esoteric pupil.
Source: Rudolf Steiner – GA 266 – From the Contents of Esoteric Classes – Esoteric Lessons Part II – Basel, 20th September 1912