I think Mark 4:10-12 says it all.
Matthew 22:
37
He said to him, “You shall love the Lord, your God, with all your heart, with all your soul, and with all your mind.
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This is the greatest and the first commandment.
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The second is like it: You shall love your neighbor as yourself.
I guess that the Reformed don’t have to pay attention to the words of Jesus.