Before you diagnose yourself with depression or low self-esteem, first make sure that you are not, in fact, just surrounded by assholes.
— Sigmund Freud

It is not always easy to diagnose. The simplest form of stupidity - the mumbling, nose-picking, stolid incomprehension - can be detected by anyone. But the stupidity which disguises itself as thought, and which talks so glibly and eloquently, indeed never stops talking, in every walk of life is not so easy to identify, because it marches under a formidable name, which few dare attack. It is called Popular Opinion...
Robertson Davies diagnoses quote

With one microfluidic chip, which is the size of an iPhone, you can diagnose 100 [HIV] patients at the same time.
— Frederick Balagadde

Declare the past, diagnose the present, foretell the future.
— Hippocrates

You can be diagnosed and treated early. And there is hope for the future.
— diagnoses quotation by Teri Garr