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Prophetic decrees are a higher-level prayer protocol for those who understand the laws governing God's creation. When under God's authority, faith increases because understanding of the constructs of the spiritual realm increases.
Knowing how the spiritual realm operates and the laws of creation allows believers to exercise their legal rights as heirs to salvation and co-heirs with Christ. Christ decreed and prophesied because He fully understood His authority as being one with Elohim, God the Creator and Supreme Lawgiver.