Matthew 10:37

Whosoever . . . shall confess me before men, him will I confess also before my Father which is in heaven.—He that loveth father or mother more than me is not worthy of me: and he that loveth son or daughter more than me is not worthy of me. And he that taketh not his cross, and followeth after me, is not worthy of me. He that findeth his life shall lose it: and he that loseth his life for my sake shall find it.

Blessed is the man that endureth temptation: for when he is tried, he shall receive the crown of life, which the Lord hath promised to them that love him.

There was another yoke upon those cows that day than the yoke of wood fashioned by the hands of Philistines: they were constrained of God. It was that that made them patient and willing to walk together; that, too, made them choose the new road. Born and stalled in Ekron, familiar with the field and the manger, they herded off to Beth-shemesh, along the road they had never been before.

Why did they do it? It was God.