-- the Lord said to Samuel, it repents me that I have set up Saul to be king --- 1 Samuel 15:11
-- he has turned from following me and performing my commandments --- 1 Samuel 15:11
-- Samuel did not go to see Saul any more --- 1 Samuel 15:35
-- Samuel mourned for Saul --- 1 Samuel 15:35
-- and the Lord repented that he had made Saul king over Israel --- 1 Samuel 15:35

1 Samuel 15:10-11 KJV
[10] Then came the word of the Lord unto Samuel, saying, [11] It repenteth me that I have set up Saul to be king: for he is turned back from following me, and hath not performed my commandments. And it grieved Samuel; and he cried unto the Lord all night.

1 Samuel 15:34-35 KJV
[34] Then Samuel went to Ramah; and Saul went up to his house to Gibeah of Saul. [35] And Samuel came no more to see Saul until the day of his death: nevertheless Samuel mourned for Saul: and the Lord repented that he had made Saul king over Israel.

God desires people to be obedient to him.

God has written his laws on the hearts and minds of people, so that they are without excuse for not obeying them.

Hebrews 8:10 KJV
[10] For this is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people:

Hebrews 10:16 KJV
[16] This is the covenant that I will make with them after those days, saith the Lord, I will put my laws into their hearts, and in their minds will I write them;