The Justice

At night that king was asleep on his throne, (while) on the roof (of the palace) the guards were exercising authority.
The king's purpose in (having) the guards was not that he might thereby keep off robbers and ne’er-do-wells.
He knew that the man who is just is free from (fear of) attack and secure in his heart. Justice is the guardian of pleasures; not men who beat their rattles on the roofs at night.

 The Masnawi, Volume 4, 730