More than our minds can hold
Incomprehensibility is a big word for a humble truth: no person can fit God inside their mind. We can know what God has shown us truly, but not completely. We do not stand over God as experts who can explain every part of his nature, wisdom, or plan.
Isaiah spoke this truth to people whose future felt uncertain. God told them that his thoughts and ways rise far above theirs (Isaiah 55:8-9). That does not dismiss careful thinking or honest questions. It reminds us that God sees the whole story when we can only see part of it.
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.
Mysterious does not mean unknowable
God's incomprehensibility does not mean he hides from everyone or gives us nothing solid to trust. Scripture presents him as the God who speaks, acts, makes promises, and invites people into relationship with him. There will always be depths we cannot reach, but what he reveals is real.
Moses experienced both sides of this. He asked to see God's glory, and God graciously answered by showing his goodness, while also setting a boundary on what Moses could bear (Exodus 33:18-19; Exodus 33:20-22). God draws near without becoming manageable. He can be known, but never controlled.
And he said, I beseech thee, shew me thy glory. And he said, I will make all my goodness pass before thee, and I will proclaim the name of the Lord before thee; and will be gracious to whom I will be gracious, and will shew mercy on whom I will shew mercy.
Jesus shows us God's heart
For Christians, Jesus is the clearest revelation of God. John says that the Son has made the unseen God known (John 1:18). So when Jesus heals the sick, welcomes people others reject, confronts hypocrisy, forgives sin, and gives himself for the world, we are seeing the character of the Father.
Jesus told Philip that seeing him was seeing the Father (John 14:9). That does not mean every question about God's being becomes simple. Christians have reflected on these mysteries for centuries. But it does mean we need not guess whether God is compassionate, holy, faithful, or loving. Look at Christ.
No man hath seen God at any time; the only begotten Son, which is in the bosom of the Father, he hath declared him.
A reason for trust and worship
Paul ended his reflection on God's mercy with wonder. He praised the depth of God's wisdom and admitted that God's judgements and ways cannot be fully traced by human beings (Romans 11:33-34). His response was not despair because he lacked every answer. It was worship because God is wiser than he is.
This can steady us when a prayer remains unanswered or a hard Bible passage leaves us puzzled. Keep asking. Read the wider context. Pray honestly, and talk with mature Christians. The Spirit helps God's people receive what God has revealed (1 Corinthians 2:10-12). God's greatness is not a wall keeping you out. It is an invitation to come to him with reverence, joy, and growing trust.
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!