The true person is grateful and thankful, for the virtuous only know how to be grateful and thankful. It is totally the level of a true person to be grateful and thankful.
Sappuriso ca kho, bhikkhave, kataññū hoti katavedī. Sabbhi hetaṁ, bhikkhave, upaññātaṁ yadidaṁ kataññutā kataveditā. Kevalā esā, bhikkhave, sappurisabhūmi yadidaṁ kataññutā kataveditā.