Isaiah 23

God deals with the merchant-nation of Tyre and punishes their pursuit of worldly diversion and accumulation of wealth.  A good lesson can be found in Matthew Henry's explanation of the second half of the chapter:

The desolations of Tyre were not to be for ever. The Lord will visit Tyre in mercy. But when set at liberty, she will use her old arts of temptation. The love of worldly wealth is spiritual idolatry; and covetousness is spiritual idolatry. This directs those that have wealth, to use it in the service of God. When we abide with God in our worldly callings, when we do all in our power to further the gospel, then our merchandise and hire are holiness to the Lord, if we look to his glory. Christians should carry on business as God's servants, and use riches as his stewards.

 A good take home for me is what I underlined, italicized, and bolded.  When we abide with God in our worldly callings, when we do all in our power to further the Gospel, then our merchandise and hire are holiness to the Lord, if we look to his glory.