His piousness was shown through his morning prayers and generous help to the poor.

piousness 是由形容词 pious（虔诚的）加上名词后缀 -ness 构成的名词，表示"虔诚的品质或状态"。pious 来自拉丁语 pius，原指对神明的虔敬，后来引申为对宗教信仰的虔诚。