Simplicity and generosity are symbiotic qualities and twin lifestyle choices. When talking about holiness we usually think of activities such as sexuality, speech, substances, and Sunday services. But the Bible speaks of our sanctification in terms generosity to the poor as much or more than all of these put together. I refer you to a fairly extensive list of Bible passages on the topic on musingthmysteries.wordpress.com under the same tile: "Simplicity and Generosity."