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Is loving ourselves as much as someone else sin?
The thing that goes against our nature is to think God, and then others, should come before self, just like we already think they should love us first.
That is the amazing part about God. He demands (with love) that we become all we can be, which is not love-self first. He always wants the opposite of what we want. And he does that for the same reason parents gives their baby milk, instead of sugar water. (And, let's face it. Given the choice without dealing with the ramification, we'd rather have the sugar water. And it feels kind of bad that we're given mere milk, when there is sugar water.) Because he loves us so much he only wants what is good for us.
Right now, we're torn between having fun and doing something for God or for someone else. The "have fun" part is how much we love self. We already love self just fine. Imagine changing that around to loving others and loving God being more important than having fun. AND, more enjoyable! That's what God's plan is. We were designed to love God fully and love others as much as we love ourselves.
Sin sunk us down to love-self first.