Learning to Discern - Lesson 1 - Failing to Discern - Romans 1:28-32. Often we think of sin in degrees – some being worse than others, and when we think of categories of sin we usually think along the lines of those things which are impure, immoral, or idolatrous. We admit immediately and willingly that murder, sexual immorality, and disobedience is sin. But how often do we think that it is a sin to be undiscerning? Failing to learn how to discern is a sin according to Scripture! In this series of lessons we will learn how to discern.