Spurgeon preaches that Christians are "debtors" who owe a debt of gratitude to many people and especially to God—they owe thanks to Christians from the past who died for their faith, to people working for God in the present, and they have a responsibility to pass on the truth to future generations. He emphasizes that Christians owe everything to God's love, mercy, and grace, and since God forgave their sins through Jesus, they should humbly serve Him not out of obligation to pay for salvation (which Jesus already paid), but out of thankfulness for what He's done. The sermon warns non-Christians that they still owe a debt to God's justice for their sins, and they need to accept Jesus as payment for that debt before it's too late.
A sermon delivered by Charles Spurgeon on August 17, 1856.