God's Justice Satisfied

Why is preaching without love worthless? What did it take for Christ to become God in the flesh? Why did Christ require a body in order to be the Savior? Why did Christ have to be the Lamb without blemish or spot, perfect? Does our nature improve as we get older? Can we rule this flesh? Why did God need a Savior? Why does God send people to hell? Why does God save only some when He could save all?