It's an invention of men who want to define God. They can't and they're fools for trying. Worse, they've mislead many, but we're God-blessed to have Mr. Gutenburg and all the martyrs who died so that we could have a Bible to read for our very own self, plus an Internet to search out the truth.
Imagine an ant stumbling upon a watch. Though the ant is familiar with night and day and perhaps aware of the seasons the watch means nothing to the ant. That's man's mind to God's, yet we have the Holy Ghost and the Holy Bible and those willing to share and teach the truth.
John 1 (niv)
1 In the beginning was the Word, and the Word was with God, and the Word was God. 2 He was with God in the beginning. 3 Through him all things were made; without him nothing was made that has been made. 4 In him was life, and that life was the light of all mankind. 5 The light shines in the darkness, and the darkness has not overcome it.