When this happiness occurs in oneself, he feels an easiness in his body. He feels a great easiness and alleviation in his mind. Thus, he has kāya passaddhi and chitta passaddhi. Tranquility or levity is passaddhi. There is thus bodily and mental tranquility. These occur because he is in a great joy that resulted from the eradication of defilements and the cultivation of wholesome Karma. He cultivates this tranquility in this manner as an element of realization of the Four Noble Truths.