Cure Light Wounds is ultimately the most efficient healing spell in the game. Its base effect is almost non-existent, restoring from 2 to 9 hit points. However, as all other healing spells, increasing proficiency with the spell by 1 level will allow to restore 1 additional hit point. Theoretically, with enormously trained spell its base healing effect becomes insignificant which, combined with incredibly low cost of Cure Light Wounds, makes it superior in restored amount HP per 1 PP spent ratio.