As the father of an elementary-age boy, I think I know why God places so much emphasis on obedience. Boys can get themselves into so much difficulty so easily. I can't imagine the trouble they would get into if they weren't required to obey anyone.
Take, for instance, my rule about crossing the street. Steven knows that he's supposed to stop at the end of the driveway and look both ways--whether he is riding his bike, rollerblading, or just chasing a ball. I expect 100-percent obedience because I know that it takes only one careless step into the street to jeopardize his safety.
When God sent Saul to attack the Amalekites for what they had done to Israel (Ex. 17:8; 1 Sam. 15:2), He expected the king to obey Him completely. When he didn't, Saul not only failed Israel but he disappointed God. And he had to suffer the results of disobedience. As Samuel told him, God "has rejected you from being king" (v.23).
The Lord, who is a perfect Father, loves us and knows what will work out best in our lives. To show that we trust Him, we need to do all we can to obey what He has told us in the Bible, His Word. He deserves our 100-percent obedience. — Dave Branon
Let your days be Mine to order;
Where I lead, obedient be.
Let your own desires be nothing;
Only seek to follow Me. --Anon.
The cost of obedience is nothing compared to the cost of disobedience.