Mainyo-i-Khard 31

The sage asked the spirit of wisdom

thus: "What is the business of the well-endeavouring, the artizans?'

The spirit of wisdom answered

thus: 'The business of the artizans is this,

that as to that work which they do not understand, they do not bring a hand to it;

and that which they well' understand (hû-dânend), they perform well and with attention;

and they demand wages lawfully. (8). For as to him who persists in doing that work which' he does not understand, it is he by whom that work is spoiled and becomes useless; and when, moreover, he is a man whose work makes himself satisfied, it then becomes even an origin of sin for him.'