Why is the concept of presumption sin important for Christians?

The sin of presumption involves the belief that one can contribute to their salvation or stand before God based on their deeds. As seen in Numbers 15:32-36, the man who gathered sticks on the Sabbath acted presumptuously, failing to rest in God's provision. This teaches us that any attempt to supplement what Christ has done for us with our own works is not only futile but also damning. Believers are called to recognize that salvation is complete in Christ alone, and that any notion of personal merit is a grave error that undermines the grace of God. Emphasizing the importance of resting in Christ protects against the dangerous tendency to skew the gospel by adding personal works to the equation.