This article highlights the concept and categories of kindness according to the law of sufficient reason. Kindness is not only an irrational but also a rational activity that is followed by a rational decision. The article deals with the issues that kindness is a natural spiritual need and a positive factor, based on a person’s level of knowledge, is boundless and relies on norms and gratitude, that a person has a constant desire for kindness, and this desire increases higher and higher, nothing can suppress parental love