How do we know that sin is a serious issue according to the Bible?

Scriptural passages, such as Romans 6:23, affirm that the wages of sin is death, emphasizing its seriousness. In 1 John 1:8-10, believers are reminded that if they claim to be without sin, they deceive themselves. This acknowledgment of sin is crucial for true fellowship with God because without recognizing our sinful state, we cannot fully appreciate the grace given through Christ. The Old Testament is replete with examples of God's judgment on sin, illustrating that it is not a trivial matter but a fundamental aspect of humanity's need for redemption.