An alloy is a metal made by combining two or more metallic elements, especially to give greater strength or resistance to corrosion.
Tempering is a heat treatment technique applied to iron-based alloys, such as steel or cast iron, to achieve greater toughness by decreasing the hardness (brittleness) of the alloy. The reduction in hardness is usually accompanied by an increase in ductility, thereby decreasing the brittleness of the metal.
Tempering means heating the metal to some temperature below the critical point for a certain period of time.
The mind is an alloy of thoughts (lion) and emotions (eagle).
Brittleness (Saturn/Salt) of mind decreases its ductility, meaning the ducting of inspirations from the Higher Self (angel).
Steel/iron is the metal of Mars (fire), the raw bodily force, concentrated in the chakra behind the navel.
If a mind is hard (stubborn), it can break, a strong mind (flexible/liquid) does not break. A wall is hard, water is strong.
The furnace (mind) of the Alchemist shall be subjected to tempered heat (not too much ‘Mars’ and not too little).