Psalm 51:4 (NKJV), Against You, You only, have I sinned, and done this evil in Your sight—that You may be found just when You speak, and blameless when You judge.
Even when we sin against others, the true transgression is against God. Unbelievers accuse God of being judgemental. Why wouldn’t He be? God sets the controls for the heart of the universe; God the Creator alone defines what is good and right. The Creator has every right to judge you. Who are you to judge God? No one. You don’t like being given limitations? Then disobey your parents, cheat on your spouse, do what you want at work, live in anarchy against your government. See how long you can live without limits before you get yourself killed.
God is Judge, and we should fear Him. Yet He is a merciful judge. When you plead guilty in God’s court and trust in Christ for forgiveness, God says, “I forgive you your sins,” and you can go on your merry way; you do not have to earn God’s forgiveness, otherwise it is no longer grace and mercy. Grace and mercy do not need reasons to forgive; they simply forgive because that is their desire, and God’s desire is that He forgive you on the basis of Christ alone.
The Lutheran Column 