This is another verse referenced in The City of God along with a follow-up commentary by St. Augustine.
1 Timothy 6
Teach those who are rich in this world not to be proud and not to trust in their money, which is so unreliable. Their trust should be in God, who richly gives us all we need for our enjoyment. Tell them to use their money to do good. They should be rich in good works and generous to those in need, always being ready to share with others. By doing this they will be storing up their treasure as a good foundation for the future so that they may experience true life. – 1 Timothy 6:17-19
St. Augustine’s Follow-Up
They who were making such a use of their property have been consoled for light losses by great gains, and have had more pleasure in those possessions which they have securely laid past, by freely giving them away, than grief in those which they entirely lost by an anxious and selfish hoarding of them.