How do we buy something that is priceless, like eternal life, without using any money? We use our diligence (our earnest, steady and energetic effort). Being diligent about our spiritual life is the price we pay for the FREE daily portions of Living Bread and Living Water—the spiritual food and water we need to fatten up (prosper) our souls. This diligence is how we make our souls spiritually fat. It works as long as we never let spiritual sluggishness (mere religious desires) keep us from daily renewing our minds.