Abstract

From the time human beings are born, they are forever confronted with the phenomena of pleasure and happiness. These two concepts are very close but there are major differences and that is that pleasure is also used in momentary cases, and happiness is used only for lasting or relatively lasting pleasures. Ibn Sina and Mulla Sadra completely separated these two concepts and provided separate definitions for them. There is a deep relationship between pleasure and happiness. Psychology has a direct effect on pleasure and happiness. According to the perceptual powers of the soul, it considers different levels for pleasure and happiness, among which it considers intellectual pleasure and intellectual or spiritual happiness in terms of evidence, proof, and quantity and quality of superior than other pleasures and happiness. And among the powers of the soul, it is the only intellectual power that has not been destroyed by death, and in the world of the hereafter, ultimate happiness and pleasure will be determined by it. The method used in this article is descriptive and analytical and the method of collecting materials is library.