Sentence:  And when psychology explains glibly , `` but the subconscious mind <WSD>is</WSD> able to produce it '' it refers to a mental region so vaguely identified that it may embrace the entire universal mind as conceivably as part of the individual mind . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)