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In plain words

"Gauri explained everything beautifully. 'E, ai!' ('This, that!') he explained so: This is the disciple! That is your Chosen Ideal! And Ravana's ten heads, he used to say, are the ten senses: tamas is Kumbhakarna, rajas Ravana, sattva Bibhishana. That is why Bibhishana attained Rama."