If the Shaliach he sent failed to carry out what he was sent to do, he should accept that this is H'shem's will and thank H'shem for choosing what was best for him. He should also thank those whom he sent to be the Shaliach according to the amount of effort they put into helping him accomplish the task
pg 425
"Words are facets of the soul -one unites with the mystery of mysteries
inherent in that world, with every word uttered"
Gate Two Chapter 14 pg 97