We're discussing how Joseph's ten brothers didn't even suspect that they were confronting their brother. We saw that they didn't fear the Lord, as shown by their lack of love for their brother. But still, why couldn't they even recognize him?
Ps 111:10 The fear of the LORD is the beginning of wisdom
Pr 1:7 ¶ The fear of the LORD is the beginning of knowledge
God works in His children to love one another. When a Christian successfully fights off God's work, he can become bitter at another Christian. It is important to remember that, lacking both wisdom and knowledge, that Christian is not qualified to lead, teach, or influence other Christians.
One Christian forum deals with Christians who have been hurt by churches. Most of the victims joined churches that would not fellowship with other Christian churches. Trying to keep their people spiritual, the incompetent leaders of those churches would hurt them instead.
Be careful about being influenced by "Christians" who are hostile to God's people. You'll save yourself a lot of grief that way.