How do we know God's love and hatred are perfectly just?

The notion of God loving and hating is discussed in passages such as Psalm 45:7 and Romans 9:13. It clarifies that God's love for righteousness naturally leads to a hatred of wickedness. This divine hatred is not arbitrary; it is a perfect and just response to sin. Unlike human emotions that can be flawed and biased, God’s responses are based on His intrinsic nature of goodness and justice. As expressed in Psalm 139:21-22, God's hatred is described as 'perfect hatred,' indicating that it is entirely right and devoid of imperfection — reflecting His sovereign authority as the ultimate judge.