“YOU cannot serve both God and money,” admonishes the Bible. But the church has always tried. In the Middle Ages monasteries were what would now be termed social enterprises. They would produce bread, books or other goods. A Franciscan monk is credited with codifying double-entry book-keeping.

These days the Catholic church and related institutions control many billions of dollars. Some is invested to earn income; some is given away for good works. The two activities have been seen as separate. But, in the pontificate of Pope Francis, that divide is blurring. “Impact” investing—intended to make money and do good at the same time—is growing in importance. It is also creating some controversy.

Read more at The Economist.