Jesus was referring to this fisherman when he said, "Upon this rock I will build my church"
Hence, when he said, "upon this rock I will build my church....," he used 
the ... the Greek word which is feminine in gender and could not possibly refer to 
Peter,... [DOC] [TLE] Upon This Rock - Cafe Logos [PAR] You are Peter, and upon this rock I will build My church, and the gates of hell ... 
but the befuddled former fisherman would grasp the concept much later, as we 
shall see.