How Should the Church Help Ourselves and the World
Should the Church help the World? Only if we make it obvious that their soulish and physical lifting does not compensate for their lack of justification in the eyes of God. Teaching the World the benefit of society won't make them children of God. We should definitely tell them how to be saved, and, to do that, we have to get together first on the issue (1 Corinthians 15:3b-8 and Romans 10:9, 10, 13).
The Church should definitely help the Church, even though the Church hasn't often cooperated in such mundane matters as we rely on the World for, and most of our actions and livelihoods are in the World. It doesn't need to be that way. It shouldn't be that way, because God's love and truth cause us to be able to create society among ourselves without fear, in the free usefulness we desire so that no one but Christ controls our communities wherever two or three are gathered together in His name.
We should love our enemies - that's true. We should, even more willingly, love each other in the reality of providing reliable mundane protection to each other, instead of allowing the World to do it, which subverts many Christians into compromise.
Are there any Christian engineers and leaders and doctors and those willing to care for the elderly and the children; are there any Christian teachers? Don't teach and doctor the World only, but group up! There's no fundamental reason not to, even if you don't (as I don't) believe that we should reclaim the World (Christ will do it by destroying it first) or to necessarily create a Utopia or The City on the Hill. But we CAN network, simply because we have learned from the World what networking is and how useful it is. We can do every useful thing! We have been handed technology! Let's spoil Egypt, dear siblings in Christ, to use what we have on the spoiled Earth to useful benefit, to the siblings first and also to our enemy the World.