God is both perfectly loving and perfectly wrathful, not because He is divided against Himself, but because His holy and just character responds differently to righteousness and sin (1 John 4:8; Deuteronomy 32:4; Isaiah 6:3). His wrath is not irrational anger but righteous opposition to all evil because of His holiness and justice (Habakkuk 1:13; Romans 6:23). Wrath is His holy and just response to sin. How can God be
both loving and wrathful? The answer is found in relationship.Since everyone is sinful (Romans 3:23), everyone starts under His wrath (e.g. John 3:36). However, God mercifully demonstrated His love when we were unlovable by sending Jesus to die in the place of sinners (Romans 5:6, 8). On the cross, Jesus bore the wrath that sinners deserved so that God could justly forgive and declare believers righteous (2 Corinthians 5:21; Romans 4:5). Those who repent and trust in Christ are no longer condemned but are adopted as God's children and forever secure in His love (Romans 5:9; Romans 8:15–16, 38–39). The cross is therefore the ultimate display of both God's wrath against sin and His love for sinners, revealing the fullness of His perfect character.
Love and wrath are not mutually exclusive concepts. We can see that with human examples. A parent, for example, can both deeply love her son while simultaneously being angered when he lies to her. While we must not map human emotion onto God, nor think of God as changing from loving to wrathful, such human illustrations help us understand how two emotions can co-exist, with the difference being one of relationship.
God indeed loves the world (John 3:16), but being loving doesn’t negate God’s wrath against sin. God would not be loving to allow sin to continue unchecked, ignore evil, or leave injustice unpunished. His wrath is not the opposite of His love but the expression of His holy and just opposition to everything that destroys His creation and dishonors His glory.
Also, even though God is love, it does not mean He had to save us. Still, He chose to save us. Salvation was His means of displaying His love, despite His relating to us in wrath. He sent Jesus to come live the perfect life we never did and then to die to feel the wrath sinners were supposed to feel.
Everyone who repents of his or her sin and trusts in Jesus as God’s substitute will be saved. That means He will count Jesus’ righteousness as the believer’s righteousness and then relates to them as if they were perfectly righteous. While God loves humanity, God has a personal, relational love for believers. They are no longer under His wrath (John 3:36) but are called His children (John 1:12) and loved as such (Hebrews 12:5–8).