Think And Grow Rich (Chapter-4 - Auto-Suggestion)-Napoleon Hill THE MEDIUM FOR INFLUENCING THE SUBCONSCIOUS MIND The Third Step toward Riches AUTO-SUGGESTION is a term which applies to all suggestions and all self-administered stimuli which reach one s mind through the five senses. Stated in another way, auto-suggestion is self-suggestion. It is the agency of communication between that part of the mind where conscious thought takes place, and that which serves as the seat of action for the subconscious mind.