Andrew Fuller's life and work are primarily known for their profound impact on the rise of the modern missionary movement. While William Carey is celebrated as the "morning star," Fuller was a central figure in providing the necessary theological foundation and practical support.
Fuller was a principal founder and the first secretary of the Baptist Missionary Society, formed on October 2, 1792, which sent William Carey to India in 1793. Fuller tirelessly served as the society's main promoter, thinker, fundraiser, and correspondent for over two decades, effectively "holding the rope" for missionaries on the field, often at great personal cost and amid significant suffering, including the loss of eight children.
His most critical contribution was his theological battle against two systems that were "deadening" to the churches and hindering missions: Hyper-Calvinism and Sandemanianism. Hyper-Calvinism denied the duty of unregenerate sinners to believe and opposed indiscriminate gospel calls, arguing it was cruel to command what they lacked the natural ability to perform. Fuller, drawing on Jonathan Edwards's distinction between natural and moral inability, argued that the inability to believe stems from a perverted will and does not remove the universal duty to believe the gospel.
Sandemanianism defined justifying faith as merely a passive, intellectual assent, stripping it of holy affections and vital activity. Fuller countered that saving faith is a holy, active fruit of regeneration, even while it justifies solely by uniting believers to Christ.
By defending the duty of all to believe and the vital, active nature of saving faith, Fuller cleared away theological barriers, providing the crucial doctrinal platform for bold gospel preaching and the launch of the greatest missionary movement in history.
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