Theragāthā 1.33 Ekakanipāta Catutthavagga Sopākattheragāthā “Yathāpi ekaputtasmiṁ, piyasmiṁ kusalī siyā; Evaṁ sabbesu pāṇesu, sabbattha kusalo siyā”ti. … Sopāko thero ….
As one would be skillful with a beloved only son, so should one be skillful with all beings, everywhere.