Quotation on sin from GotQuestions.org

We also know intuitively when we have sinned. Sin is a perversion of God’s perfect design. We all bear the very image of God Himself, and when we sin, we mar that likeness. We were created to be mirrors of the glory of God (Ephesians 2:10; 4:24; Hebrews 2:7). Sin is a big smudge on the mirror, and it diminishes the beauty and holiness we were designed to reflect. When we sin, we step outside the purpose for which we were created, thus violating God’s moral law, and we are accountable to Him for the trespass. Romans 3:23 says, "All have sinned and come short of the glory of God." Sin is anything that falls short of God’s plan. So, whether it harms us or someone else, every sin is ultimately against a holy God.