Certifcation for a computer language is like the various (natural) language test you can take. They will confirm that you can read, speak and write the language, but does it say anything about whether you can write a novel?
A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James