Back in 1910,  a man named Wallace D. Wattle published a trilogy of books each beginning with the title "The Science of"
In the second volume of that series, he published The Science of Being Great, as a follow-up to one of his most successful books, The Science of Getting Rich. 
In the first chapter of this book, Wallace lays down an argument that all men and women have greatness within them.
Each of us is blessed with the ability to think, and can use our minds to conquer unimaginable feats.