The emotions of faith, love, and sex are the most powerful of all the major positive emotions. When the three are blended, they have the effect of “coloring” the vibration of thought in such a way that it instantly reaches the subconscious mind, where it is changed into its spiritual equivalent, the only form that induces a response from Infinite Intelligence.
Love and faith are psychic, related to the spiritual side of man. Sex is purely biological, and related only to the physical. The mixing, or blending, of these three emotions has the effect of opening a direct line of communication between the finite, thinking mind of man, and Infinite Intelligence.
~ Napoleon Hill, Think and Grow Rich (1937)