*Prosperity* is a New Thought religious essay by Charles Fillmore, co-founder of the Unity movement, arguing that true wealth is spiritual rather than material. Fillmore contends that God's substance is omnipresent and inexhaustible, and that poverty and struggle result not from scarcity but from misaligned thinking — hoarding, fear, and fixation on material accumulation rather than on the spiritual "consciousness of substance" from which all supply flows. The work's most distinctive claim is that saving money out of fear of future lack is self-defeating: fear acts as a magnet that attracts exactly what is feared, so money hoarded against "rainy days" guarantees them, while money held as an "opportunity fund" with constructive intent produces increase. Fillmore draws on scripture throughout — the feeding of the multitude, the parable of the sower, Ananias and Sapphira, Jesus's poverty — to argue that genuine prosperity means cultivating an inner certainty of abundance, not accumulating outer possessions. He frames this as the true Christian calling: developing character and divine faculties (especially faith, which he calls the mind's capacity to make spiritual substance visible) rather than chasing wealth or fame. The text will appeal to readers interested in the metaphysical Christianity tradition and the theology of prosperity, but those seeking financial or conventional religious advice will find its framework entirely interior and idealist.