Emphasis Preaching Journal

In ancient culture, the cornerstone was the first stone to be laid down at the corner of a building. It was a large stone supporting two walls at right angles to each other, making it indispensable. In human terms it is used to describe the one who is least expected to succeed, one who appears to be the least qualified, but who later becomes the hero of the story. In other words, "the stone which the builders rejected has become the cornerstone."