Withstand him steadfast in your faith, knowing that your brothers who are in the world are undergoing the same sufferings.
Knowing that the same afflictions are accomplished in your brethren that are in the world - Compare for a similar sentiment, 1 Corinthians 10:13. The meaning is, that you should be encouraged to endure your trials by the fact that your fellow-Christians suffer the same things. This consideration might furnish consolation to them in their trials in the following ways: