She's the best-selling author of Simple Abundance inspirational guides that promote the power of gratitude. Look back at a past Soul Series interview Oprah conducted with Sarah Ban Breathnach to find out more about the power of keeping a gratitude journal and the possibilities you can discover by being gracious on a daily basis.

Then, tune in Sunday at 11/10c for Oprah's all-new interview with Sarah about the powerful lessons she learned from her rise on the bestseller list and the surprising turn her life took after.