Should you encounter your enemy's ox or his donkey straying, you must surely return it to him. Should you see your adversary's donkey sprawling under its load and would hold back from assisting him, you shall surely assist him.  On account of its owner's enemies, an animal should not be left to suffer; this is the classic interpretation of this law.  A midrash points to something else: the animal can mend the relationship between its owner and his enemy. The animal's unfair suffering is "the common ground" upon which the enemies can agree, and from that common ground, they may yet mend their relationship. The lesson is clear: to fix a relationship, find the points of agreement.