The King Who Wouldn't Wait

For all his striking qualities, King Saul had a least one fatal flaw... he failed to follow instructions.  He was a rule-bender who adapted things to suit his own tastes.  He was prone to walk by sight and not by faith.  And this would prove costly.  In this passage, the reader gets a glimpse into what God wanted most from those he set over his people.  Know what it is?