Acts 17 tells how Paul preached in the midst of the Areopagus, the high court of appeal in Athens.
Paul said that he could see that the people were very religious. As he passed through and observed the objects of worship, he also found an alter with an inscription: "To the unknown god."
He said that what they worship as unknown, he could proclaim to them. This God they worshipped and did not know was the God who made the world and everything in it. He is the Lord of heaven and of earth, and does not live in temples made by man. Nor can he be served by human hands, needing nothing since He Himself is God. He gives life and breath to all mankind, and from one man made every nation of mankind to live.
God determined allotted time periods and boundaries of their dwelling place for one purpose: that they should seek God. Perhaps, they would find their way toward Him and find Him. Yet, Paul proclaimed, he is actually not far from each one of us.
Even their poets had proclaimed the One True God. "In him we live and move and have our being, for we are indeed his offspring."
Being the offspring of God, we should not think that God is like anything that comes from the imagination of a man. In the times of ignorance, God overlooked this, but now he commands all people everywhere to repent. God has set aside a day when he will judge the world in righteousness by a Man that He has appointed. God gave this assurance to all mankind when He raised Him from the dead.
As Christians, we should ask ourselves: Do we serve an unknown god, or do we know the One True God? Do we worship anything that comes from the imagination of a man, or do we worship God alone? Do we look for the day when His Son, Christ Jesus will return to judge the world?