Saul replied, “When I saw that the men were scattering, and that you did not come at the set time, and that the Philistines were assembling at Mikmash, I thought, ‘Now the Philistines will come down against me at Gilgal, and I have not sought the LORD’s favor.’ So I felt compelled to offer the burnt offering.”
“You have done a foolish thing,” Samuel said. “You have not kept the command the LORD your God gave you; if you had, he would have established your kingdom over Israel for all time. 14 But now your kingdom will not endure; the LORD has sought out a man after his own heart and appointed him ruler of his people, because you have not kept the LORD’s command.”
– 1 Samuel 13:11-13
Oh, the sin and resulting heartache we could avoid by not simply relying on our own thoughts but seeking God’s thoughts first.