He has no material body, and thus, is not limited to time or space. He can be everywhere at all times.
As humans, it is hard for us to understand what it means that God is Spirit. He is a being but has no physical body. Think about how much we are limited by our physical bodies. We can only be in one place at a time. We are bound by time and must chose how to use each minute we are given. God is not bound.
Think about Jesus. When He came to Earth and allowed Himself to be clothed in a physical body, He experienced the restrictions that we face every day. He had to physically travel to where He wanted to be. He grew hungry and tired. He could only interact with the people who were present with Him in each moment of time and space.
God is not so limited. He rules the universe and deals with each of us individually at every moment of every day. He can be everywhere at once, understand all things at once, and rule based on past and future.
Understanding that God is Spirit can help us relate to Him. God created us as spiritual beings housed in a physical body. The limitations of our physical bodies are not to interfere with our interactions with God. If anything, they should enhance them. As we feel our own limitations and realize that our God does not face them, we can relate to Him and worship Him as He deserves.
Jesus told the woman at the well, God is Spirit, and those who worship Him must worship in spirit and truth (John 4:24). Worshiping God involves more than the physical body. We may raise our hands, sway our bodies, and shed tears as we worship God. True worship may be loud and expressive or calm and silent. Physical actions may reflect what is happening in our spirits, but they mean nothing if our spirits aren’t worshiping. God is way more interested in what is happening in our spirits than what happens with our bodies.
Worshiping Him in spirit involves letting His Spirit testify to our spirit of His worth. To not only know that He is God, but to experience and respond to Him as God. To know without a doubt that He is the only God and to express that in worship to Him. Worship is our spirit acknowledging that He is God.
As we approach God in worship, let’s remember that He is the One who alone has immortality, dwelling in unapproachable light, whom no man has seen or can see, to whom be honor and everlasting power. Amen (1 Timothy 6:16).
*all Scriptures are NKJV
What does it mean to you that God is Spirit?