Then there is Manamayakosh, which is mind, and the mental body. And this body has its action and reaction on both sides; it acts and reacts on the earthly bodies, and it acts and reacts upon the soul. Therefore when Lot left the two cities, which represent the physical plane, to journey toward the goal of Immortality, his wife was still with him. For it is not necessary for the mental body to stay behind when the journey towards illumination is begun. It is capable of going with the soul towards Eternity. And yet its attachment to earth and the physical plane is great, because it is made, it is built, of physical impressions, of all impressions that come from the physical world; and of necessity it wants to turn to see if the physical being or the spiritual being is leading it aright. The principal nature of mind is doubt -- whether one is doing right or wrong. And doubt and faith are enemies. While faith leads to the destination, doubt pulls back. When the mind was so pulled back, attracted by all the impressions of earthly life, it could neither take hold of the earth nor journey with the spirit, and remained neither earth nor water, but salt.