There are in fact two things, science and opinion; the former begets knowledge, the latter ignorance.
Cure sometimes
Treat often
Comfort always
Primum non nocere - First, do no harm.
If you are not your own doctor, you are a fool.
Life is short, the art long, opportunity fleeting, experience treacherous, judgment difficult.
Time is that wherein there is opportunity, and opportunity is that wherein there is no great time.
Healing is a matter of time, but it is sometimes also a matter of opportunity.