واجب نبود به کس بر، افضال و کرم
واجب باشد هر آینه شکر نعم
تقصیر نکرد خواجه در ناواجب
من در واجب چگونه تقصیر کنم؟
Favor and generosity are owed to no one, yet giving thanks for blessings is always owed; if the master did not fail in what was not required of him, how could I fail in what is required of me?
Rudaki