Jesus is in the process of reigning. I Cor 15 tells us that the end will come when he has accomplished the purpose of his reign; which is to put down, i.e. conquer, all rule, authority and power. The last enemy which he will put down is death. These, rule, authority and power, are not men or man made institutions but spiritual forces which oppose the Reign of God upon the earth. This opposition to God's reign upon the earth manifests itself in sickness, poverty, destruction. Jesus does this reigning through the church. Jesus has given the church authority to reign. The Church is the one which is supposed to be engaged in the putting down of all rule and authorities and powers.