Hippocrates said this quote

People think that epilepsy is divine simply because they don't have any idea what causes epilepsy. But I believe that someday we will understand what causes epilepsy, and at that moment, we will cease to believe that it's divine. And so it is with everything in the universe

~ Hippocrates

There are in fact two things, science and opinion; the former begets knowledge, the latter ignorance.

~ Hippocrates

The physician must be able to tell the antecedents, know the present, and foretell the future — must mediate these things, and have two special objects in view with regard to disease, namely, to do good or to do no harm.

~ Hippocrates

As to diseases, make a habit of two things — to help, or at least, to do no harm.

~ Hippocrates