Who said "The obvious cannot be seen"?

This quote is attributed to Salvor Hardin.

The obvious cannot be seen - Salvor Hardin

"The obvious cannot be seen"

Salvor Hardin Knowledge

Character in Foundation

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"Violence is the last refuge of the incompetent"

"It is the chief characteristic of the religion of science that it works"

"Found a religion? It's the only way to keep them quiet"

"Violence is the last refuge of the incompetent"

"We're not just after treasure. We're preserving history."

"The mind is humanity's greatest tool."

"A tidy room reflects a tidy mind."

"You can learn a lot about a person by how they keep their space."