He knows not his own strength that hath not met adversity

Evil

They that know no evil will suspect none.

Illness

If you be sick, your own thoughts make you sick

Suspicion

A new disease? I know not, new or old, but it may well be called poor mortals plague for, like a pestilence, it doth infect the houses of the brain till not a thought, or motion, in the mind, be free from the black poison of suspect.