Many unsaved people practice astrology (i.e., horoscopes) and other unscriptural use of the signs in the heavens. Believers should reject these practices.
When men choose to reject the truth, God tends to withhold further truth from them. The result is spiritual and intellectual darkness.
Sin affects men in various ways, but it attacks them in every facet of life. It hinders their walk with God and hurts their ability to reach others for Christ.
Most people view sin as a private or earthy matter. Yet, every sin is against the Lord. In truth, men can sin against the Father, the Son, and the Spirit.
