God is near, not distant
To say God is immanent is to say he is not a remote maker who set the universe running and then stepped away. Scripture presents him as near to his creatures. When Paul spoke in Athens, he explained that God gives people life and breath, and that no one is far beyond his reach (Acts 17:25, Acts 17:27-28).
That doesn't mean God is only present in churches or religious moments. He is aware of every place and every life. David marvelled that there was nowhere he could go beyond God's presence (Psalm 139:7-10). God's nearness can be a deep comfort, especially when life feels lonely or confusing.
That they should seek the Lord, if haply they might feel after him, and find him, though he be not far from every one of us:
Near to creation, yet greater than it
God's immanence needs to be held alongside his greatness. He is involved in creation, but creation is not God. The Bible does not teach that trees, oceans, people, and God are all the same thing. Rather, the living God made all things and remains distinct from what he made (Genesis 1:1, Acts 17:24).
Jeremiah records God asking whether heaven and earth are filled with his presence (Jeremiah 23:23-24). At the same time, Solomon recognised that even the heavens could not contain God (1 Kings 8:27). So God is truly present everywhere, while never being limited by space, matter, or human understanding.
Can any hide himself in secret places that I shall not see him? saith the Lord. Do not I fill heaven and earth? saith the Lord.
Jesus shows God's nearness
For Christians, God's immanence becomes especially personal in Jesus. John's Gospel says that the eternal Word became flesh and lived among us (John 1:14). Jesus was not simply a wise teacher pointing people towards a distant God. In him, God came near in a human life, sharing ordinary meals, weeping with grieving friends, welcoming outsiders, and bearing suffering.
Jesus could say that seeing him was seeing the Father (John 14:9). This does not mean the Father and the Son are identical persons. It means Jesus truly reveals what God is like. God's nearness has a face: holy, merciful, truthful, and full of grace.
And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth.
A present help for daily life
God's nearness is not only an idea for theologians. It shapes prayer, worship, and courage. The Lord is close to those whose hearts are broken, not indifferent to their pain (Psalm 34:18). Believers are also described as God's temple because his Spirit lives in them (1 Corinthians 6:19).
That promise isn't a claim that Christians always feel God's presence. Feelings rise and fall. The biblical assurance rests on God's character and promise, not on a particular emotional experience. You can bring him the honest parts of your day, including doubt, grief, gratitude, and need. Reading passages such as Psalm 139 slowly can be a good place to begin.