It was God's purpose to bring us into being [spiritually] by the message of truth, so that we could become a kind of "firstfruits" of those He created. [Note: "Firstfruits" here suggests either that Christians are the best of all of God's creatures (Num. 18:12), or that they were the first to be converted, with many more to come].

For, suppose a person comes into your assembly wearing a gold ring and dressed in fine clothing and [then another] person comes in who is poor and dressed in shabby clothing.

Your gold and silver have tarnished and their tarnish will be a testimony against you [i.e., you have hoarded your wealth instead of using it to benefit others], and they will devour your flesh as fire [i.e., your riches will ultimately consume you]. You have hoarded up your riches in these last days.