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. (p74)
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Book Title: Open Your Mind to Prosperity by Catherine Ponder

You can open your mind to prosperity when you realize the true definition of the word: You are prosperous to the degree you are experiencing peace, health and plenty in your world. (p14-15)
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Book Title: Like a Miracle by Ernest Wilson

Prosperity is basically an attitude of thought and feeling, only secondarily a matter of money. For ideas are the coins of the mind realm. (p144)

In an individual or in a nation, prosperity depends largely upon good circulation - a wholesome atmosphere of giving and receiving, breathing in and breathing out.
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[The experience of prosperity in your life is more an attitude than an actual experience of large quantities of material resources. It is noticing all the gifts and blessings in your life and cultivating a joyful attitude of plenty (and gratitude for that plenty), regardless of whatever your outer circumstances may be. It is also a generous willingness to share your material resources freely with others, with the unshakable certainty that Spirit (and not your material supply of wealth) is the inexhaustible and loving Source of your good. As you seek always to align your mind with God-Mind, and serve as a channel for Love in the world, you are allowing the abundant flow of God's creative energy to increase and become manifest in your life circumstances.]