Final answer:
The correct answer is option a. Paul urged Corinthians to be persistent in their faith-driven efforts because their work for the Lord is not in vain, aligning with Martin Luther's doctrine of salvation by faith alone. This is distinct from joining utilitarian organizations, which people do for tangible benefits. The Protestant work ethic suggests good deeds don't secure heaven but are a testimony of faith.
Step-by-step explanation:
Paul's exhortation to the Corinthians to be steadfast, unmovable, always abounding in the work of the Lord is rooted not in the pursuit of earthly rewards or the need to earn salvation, but in the recognition that their labor is not in vain in the Lord. This approach aligns with the Protestant belief, particularly emphasized by Martin Luther, that salvation is by faith alone - a concept he found articulated in the writings of St. Paul. The Protestant work ethic, influenced by the concept of predestination, does not see good deeds as a means to secure a spot in Heaven; salvation is seen as a gift from God, and not something to be earned through works or obedience.
Looking at the context of why people engage in certain types of organizations or religious practices, it's essential to differentiate between actions motivated by faith and those motivated by utilitarian purposes. While utilitarian organizations might draw individuals who are seeking tangible benefits (a concept related to social interaction and behaviour rather than spiritual commitments), the encouragement to be steadfast in the work of the Lord is a call for spiritual endurance and dedication, stemming from one's relationship with God and faith.