Albert Barnes Commentary Acts 15:18

"Saith the Lord, who maketh these things known from of old." — Acts 15:18 (ASV)

Known unto God, and so on. (See Barnes on Acts 1:24).

The meaning of this verse, in this context, is this. God sees everything future; he knows what he will accomplish; he has a plan; and all his works are so arranged in his mind, that he sees all things distinctly and clearly. As he foretold these, it was a part of his plan; and as it was a part of his plan long since foretold, it should not be opposed and resisted by us (Known unto God: Numbers 23:19; Isaiah 46:10).