“A person who knows all that is good and all that is true — as much as can be known — but does not resist evils, knows nothing.”
Apocalypse Explained #1180
Original
Homo qui scit omnia bona et omnia vera, quotcunque sciri possunt, et non fugit mala, nihil scit
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Emanuel Swedenborg 13
Swedish 18th century scientist and theologian 1688–1772Related quotes

“True and baseless evil is as rare as the purest good--and we all know how rare that is…”
Source: The Eyre Affair

"Fortunately"
Versus (1949)
Context: A young person is a person with nothing to learn
One who already knows that ice does not chill and fire does not burn...
It knows it can spend six hours in the sun on its first
day at the beach without ending up a skinless beet,
And it knows it can walk barefoot through the barn
without running a nail in its feet....
Meanwhile psychologists grow rich
Writing that the young are ones' should not
undermine the self-confidence of which.

Characterizations of Existentialism (1944)

“I defy you all
To know twice as much as nothing at all
It's still nothing at all.”
"A'Rebours"
Lyrics and poetry

“Hardly any man is clever enough to know all the evil he does.”
Il n'y a guère d'homme assez habile pour connaître tout le mal qu'il fait.
Maxim 269.
Reflections; or Sentences and Moral Maxims (1665–1678)

Source: You Learn by Living (1960), p. 63