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By the understanding we mean that which at once perceives, judges and discriminates, the true reason of the human being not subservient to the senses, to desire or to the blind force of habit, but working in its own right for mastery, for knowledge. <ref>http://incarnateword.in/cwsa/23/the-purified-understanding#p5</ref>

'''''Intermiscence of Desire''''' - The first cause of impurity in the understanding is the intermiscence of desire in the thinking functions, and desire itself is an impurity of the Will involved in the vital and emotional parts of our being. When the vital and emotional desires interfere with the pure will-to-know, the thought-function becomes subservient to them, pursues ends other than those proper to itself and its perceptions are clogged and deranged. The understanding must lift itself beyond the siege of desire and emotion and, in order that it may have perfect immunity, it must get the vital parts and the emotions themselves purified.