How do we know God's justice and mercy are true?

God's justice is evident as He promises that He will not leave the guilty unpunished, as stated in Nahum 1:3, 'He will not acquit the wicked.' This shows the seriousness with which He regards sin. However, His mercy is equally clear, focusing on His willingness to forgive through Jesus Christ. Romans 2:4-6 reminds us that the kindness of God leads to repentance. This duality of justice and mercy is perfectly represented in the sacrifice of Christ, who bore the punishment for our sins, thereby satisfying God's justice while extending grace to those who believe in Him.