# why do you judge your brother? And you, why do you despise your brother?

"it is wrong for you to judge a fellow believer, and it is wrong for you to despise a fellow believer!" or "stop judging and despising a fellow believer!" 

# For we will all stand before the judgment seat of God

"For God will judge us all". The judgment seat of God or Christ represents a time when all people, including Christians, will be held accountable for the way they lived their lives.