What does the Bible say about moralism and relativism?

The scripture teaches that moralism—the belief that we can earn favor with God through our own good works—and relativism, the idea that moral truths can change based on individual perspectives, are both inherent tendencies of mankind. These tendencies reveal the work of the law written in our hearts (Romans 2:15). Jesus confronted these misconceptions frequently in His ministry, particularly by challenging the Pharisees and Sadducees, who epitomized such flawed thinking. The law serves as a mirror that reflects our inherent sinfulness and our desperate need for grace.