“Primum non nocerum. (First do no harm)”
“As to diseases, make a habit of two things — to help, or at least, to do no harm.”
“Declare the past, diagnose the present, foretell the future.”
“There are in fact two things, science and opinion; the former begets knowledge, the latter ignorance.”
“Extreme remedies are very appropriate for extreme diseases.”
“That which is used - develops. That which is not used wastes away.”