John Piper wrote:

“Sin is not small, because it is not against a small Sovereign. The seriousness of an insult rises with the dignity of the one insulted. The Creator of the Universe is infinitely worthy of respect and admiration and loyalty. Therefore, failure to love him is not trivial.”

Source: John Piper, The Passion of Jesus Christ: Fifty Reasons why He Came to Die (Wheaton: Crossway, 2004), 21.