From love arises hatred of those things which are contrary to what we love...
That one is found on page 13 of Religious Affections.
Edwards is looking at the question, "What is true religion?" And a large part of that answer is affection. Loving God, the greatest command of all. But what does it mean to love God?
I love my family. If you want to get on my bad side, do something that harms my family. What kind of husband would I be if I said I loved my wife, but watched as someone abused or berated her and did nothing? What kind of father would I be if I observed my children being bullied and just watched and laughed. No, my love and affection for them would cause me to react in a different way.
So what about God? Do we love Him? Do we come to His defense when He is attacked?
My 9 year old son and I were driving to the county fair, listening to the radio. A man was on who had witnessed many atheists and those who had given up their faith. He said that in his experience, people who rejected God on a rational basis always had a painful past that led to this attitude. As he spoke, he mentioned one who had rejected God because his fiance had gotten ill, and even after much intense prayer, she died. I was not aware how intently my son was listening, but suddenly he burst out, "That's ridiculous! You shouldn't hate God just because your fiance dies! God can't do everything! Well, He can, but He does not have to. You shouldn't hate God just because you don't get what you want!"
And I pray that that child-like affection and devotion, that love and instinct to protect a God that he loves, will never, ever die. No wonder Jesus loved the little children, and stated that the Kingdom of Heaven belongs to such as them.