"Among desires some are natural and necessary, some are natural but not necessary, and others neither natural nor necessary, but due to idle imagination." (PD XXIX P 503b)
"Of desires, all that do not lead to a sense of pain, if they are not satisfied, are not necessary, but involve a craving which is easily dispelled ..." (PD XXVI P 503b)
"... of the necessary [desires,] some are necessary for happiness, others for the repose of the body, and others for very life." (LM P 500b)
Kinds of Desire: