From a Christian perspective, the Beatitudes teach that believers are blessed even in hard times because they will receive eternity in heaven. Also, we are blessed for having honorable qualities such as being meek, righteous, merciful, pure, and peacemakers. The horrors of war are discussed.
Give to Caesar what belongs to Caesar, and to God what belongs to God. Jesus draws the sharp distinction between the kingdom of the world, and the kingdom of God. Under Caesar, we have certain obligations that involve material things. Under Christ, we have other obligations that involve things eternal.