The phrase points to God's greater wisdom
People often say God works in mysterious ways when an outcome surprises them or when they cannot make sense of what has happened. The saying is not a Bible verse. Still, it reflects a biblical truth: God's thoughts and plans are not limited by our perspective. Isaiah contrasts God's ways with ours, not to make God seem distant, but to show that he sees more than we do (Isaiah 55:8-9).
Paul reaches a similar point after tracing God's saving work among Jews and Gentiles. He marvels at the depth of God's wisdom and knowledge in Romans 11:33. There are things God has revealed clearly, and things he has not. Deuteronomy 29:29 says that the hidden things belong to God, while what he has made known is given so his people can live faithfully.
O the depth of the riches both of the wisdom and knowledge of God! how unsearchable are his judgments, and his ways past finding out!
Mystery does not mean God is random
Not understanding God is different from believing he has no purpose. Scripture portrays him as faithful and wise, even when his path is hard to trace. Joseph's brothers sold him into slavery, an act they meant for harm. Years later, after Joseph had become a leader in Egypt and many lives had been preserved from famine, he could see that God had brought good through their evil choice (Genesis 50:20).
That story does not call evil good. Joseph names his brothers' intention as evil. Yet it shows that human wrongdoing does not place God beyond reach or leave him unable to redeem what has been damaged. God's hidden work is not an excuse for cruelty, injustice, or careless decisions.
It is not a quick answer to suffering
When someone is grieving, sick, betrayed, or facing loss, “God works in mysterious ways” can sound thin or even painful. The Bible makes room for honest questions. David asks why God seems far away in trouble (Psalm 10:1), and Jesus himself weeps at Lazarus's tomb before raising him (John 11:35). God does not ask hurting people to pretend that loss does not hurt.
Romans 8:28 offers real hope, but it does not promise that every event is good, or that every reason will become clear in this life. It speaks of God working for good for those who love him and are called according to his purpose. Often the first faithful response is not explaining the mystery, but bringing the pain to God in prayer and receiving care from other people.
And we know that all things work together for good to them that love God, to them who are the called according to his purpose.
Trust what God has shown
The centre of Christian trust is not that every confusing event will make sense straight away. It is the character of God shown in Jesus. God loved the world by giving his Son, and Jesus entered human suffering rather than watching it from a distance (John 3:16). The cross looked like defeat, yet God raised Jesus from the dead and made it the basis of forgiveness and new life (Acts 2:23-24).
So when God's ways feel mysterious, you do not have to manufacture an explanation. You can hold on to what Scripture makes clear: God is wise, God sees, God hears, and God has acted decisively in Christ. Keep reading the passages around these verses, pray honestly, and let trusted Christians walk with you through the questions.
For my thoughts are not your thoughts, neither are your ways my ways, saith the Lord. For as the heavens are higher than the earth, so are my ways higher than your ways, and my thoughts than your thoughts.