How do we know the prayer of faith is effective?

The effectiveness of the prayer of faith lies in its reliance on God's sovereignty rather than the individual's strength of belief. This perspective aligns with the understanding presented in James 5, where the prayer of faith shall save the sick. It is essential to recognize that while faith is critical, the outcome is ultimately determined by God's will. This is consistent with Matthew 8, where healing points towards spiritual salvation as integral to faith in Christ's authority to heal, bringing the focus back to the relationship with God rather than a mere expectation of healing.