। ॥ । ४० ॥
In plain words
A command is not the only thing that gets people moving — so does simply knowing that something they want is there. "The king is on his way." "A son has been born." People hear that, and they act.
Close to the Sanskrit
Injunction alone does not generate activity; knowledge of a desired object does so as well. By the knowledge 'the king is coming', 'a son has been born', people set to work.