This concept can’t be avoided in Scripture (though we do a good job of trying). The gospel, the Kingdom, is this simple (and yet, this difficult):
“How long will you defend the unjust
and show partiality to the wicked?
Defend the weak and the fatherless;
uphold the cause of the poor and the oppressed.
Rescue the weak and the needy;
deliver them from the hand of the wicked.” (Ps. 82:2-4)
Too often we have v. 2 down cold in our lives and practice. It is verses 3-4 we too often find ourselves failing.
The simplicity of the Kingdom of God is to keep our hearts and eyes and actions toward the marginalized. This is our great difficulty. We fail too often.