Note 3 at Lu 21:19: The context of this statement is about persecution (Lu 21:12-17) and the compensation for enduring it that we will receive in the resurrection (see note 2 at Lu 21:18). So the patience that Jesus was speaking of here is the calm assurance that God knows every hurt that we feel, and He will abundantly recompense us (Heb 11:26) in the resurrection. This knowledge enables us to dominate our emotions in the face of persecution (i.e., possess our souls) instead of letting our emotions of fear dominate us.