The spiritual laws of Prosperity and Abundance have always been taught by Unity. Here are some thoughts on the subject by Unity Founders, Charles and Myrtle Fillmore:

"You should expect prosperity when you keep the prosperity law. Therefore, be thankful for every blessing that you gain and as greatly grateful for every demonstration as for an unexpected treasure dropped in your lap. This will keep your heart fresh; for true thanksgiving may be likened to rain falling upon ready soil, refreshing it and increasing its productiveness."
- Charles Fillmore, Prosperity

"True prosperity is not making money, or putting out good or developing property. It is determining what our individual soul requires in order to cause it to unfold more and more of God; and then how to harmonize its expression with the needs of our fellow man so that all are really benefited and inspired to unfold and express more of their inner spiritual resources."
From Myrtle's Healing Letters by Myrtle Fillmore