Moon is always wavering, while Saturn on the other hand is slow moving. If the sub-lord of Moon is Saturn, it helps in focusing the mind towards meditation and spirituality. Saturn being the sub-lord of Moon is an indicator of spiritual success according to KP.
If Saturn is in the 1st house in Libra, Sagittarius, Capricorn, Aquarius or Pisces rashi, then the person will be like a king, head of some village or great intellectual.