When we look at Gods Word, we find that there are many words or ideas used repeatedly. Repetition is a handy tool. It is used in schools to teach children to read and write, it is also used by advertisers to intice us to buy their product intead of the competitors. Repetition imprints ideas or lessons in our minds so that we will remember them later. God uses repetition to teach us laws and concepts that are close to His heart. As Jer 29:11 says,

For I know the plans I have for you," declares the LORD , "plans to prosper you and not to harm you, plans to give you hope and a future.