1Co 4:7 ¶ For who makes you differ from another? And what do you have that you did not receive? Now if you did indeed receive it, why do you boast as if you had not received it?
Was Saul a good king? 2 Samuel 1:23 tells us that "Saul and Jonathan were beloved and pleasant in their lives..." Saul did not take bribes or corrupt justice. He did not steal another man's wife, murder her husband, and provoke civil wars, as David would later do. But Saul made a key error in thinking that he was king because he was better than David. Saul was king because God made him king, and God had the right to give the kingship to somebody else.
"Covetousness" is wanting something that God doesn't want you to have. "Jealousy" is wanting to keep something that God doesn't want you to keep.