YOU SAID:

I can only say that i am the smartest person alive

INTO JAPANESE

私は生きている中で最も賢い人だとしか言えません

BACK INTO ENGLISH

I can only say that I am the smartest person in my life

INTO JAPANESE

私は私の人生で最も賢い人だとしか言えません

BACK INTO ENGLISH

I can only say that I am the smartest person in my life