What are the three obligatory steps of the path of comprehension?

Answers from the books of Samael Aun Weor

 

“If someone develops the imagination, he can learn to think psychologically. Imagination, Inspiration and Intuition are the three obligatory paths of the Initiation; but if we don´t learn, we remain bottled up exclusively within the sensorial functionalism of the intellectual apparatus, it won´t be possible to go up the steps of imagination, Inspiration and Intuition.”

Excerpts from the lecture the World of the Mind by Samael Aun Weor.