Torah, Deuteronomy 22:02-03: But if your brother is not near you, or if you do not know him, you shall bring it into your house, and it shall be with you until your brother seeks it out, whereupon you shall return it to him.
So shall you do with his donkey, and so shall you do with his garment, and so shall you do with any lost article of your brother which he has lost and you have found. You shall not ignore [it].
“Your brother” and all his possessions, including animals, symbolize desires that need to be corrected. You can use his animals, only not to kill them: You can feed, milk, and work with them in the field but only until you are asked to return them back.
The fact is that the desires developing in you sometimes cannot be corrected at your current level, and at a lower egoistic level you can do it precisely because you are using them temporarily.
Imagine that you have to perform a certain task, but you are too lazy. However, when you see that it is not yours, you are thrilled, you have a desire, an opportunity to fulfill it, and you take it upon yourself namely because it is not yours and relates to another. It frees you from the pressure that you feel when you are obliged to do something.
That is, you carry out the correction on a secondary level, as if performing it for another, thereby making it much easier. Moreover, you have no right not to use this opportunity. Hence it is written: “Do not ignore it.”
From KabTV’s “Secrets of the Eternal Book” 9/28/16