How do we know God's grace is sufficient for true rest?

We can be confident in God's grace for true rest because it is not based on our performance but rather on the completed work of Christ. As outlined in Ephesians 2:8-9, salvation is by grace through faith, not of works, allowing us to rest from efforts to earn God's favor. The sermon emphasizes that true rest can only come from recognizing our shortcomings and relying entirely on Christ, who fulfilled the law's demands on our behalf. This assurance is found in the promises of Scripture that declare God's grace is abundant and His mercies are new every morning, confirming that true rest is found in surrendering our works to embrace His righteousness.