As true as this statement might be as a statement of humility, it cannot be literally true. Anyone that lacking in mental worth would not be able to write the sentence. I would call it an example of hyperbole. For those not paying attention in junior high that is a literary devise of exaggeration to make a point.
Humility is important in life. It keeps us from taking ourselves too seriously. At times I get stressed because I have not changed the world. When I was young and excited I thought God had called me to make a big difference. He has kept reminding me that He is quite capable of running the universe without my fine qualities. That is why we have verses like Micah 6:8,
(Micah 6:8 KJV) He hath shewed thee, O man, what is good; and what doth the LORD require of thee, but to do justly, and to love mercy, and to walk humbly with thy God?So? I know I have referred to this verse frequently but not as frequently as I need to be reminded of it. Compared to God our greatest scholar is not even ready to organize the card catalog. I am far from the greatest scholar. The miracle is that He still has a place for me in eternity. Rejoice. He has a place for you too.