Theragāthā Ekakanipāta Catutthavagga 1.33. Sopākattheragāthā “Yathāpi ekaputtasmiṃ, piyasmiṃ kusalī siyā; Evaṃ sabbesu pāṇesu, sabbattha kusalo siyā”ti. … Sopāko thero ….