Who said "The deepest truths are often whispered, never shouted"?

This quote is attributed to Porfiry Petrovich.

The deepest truths are often whispered, never shouted - Porfiry Petrovich

"The deepest truths are often whispered, never shouted"

Porfiry Petrovich Wisdom

Character in Crime and Punishment

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"I simply cannot bring myself to believe in the extraordinary faculties of certain individuals."

"We all have demons within us."

"Life is not a mathematical problem."

"Freedom without morality is destruction."

"I'm not angry, I'm just disappointed."

"The best things in life are free."

"You can't have everything in life, but you can have what matters most."

"A woman's intuition is rarely wrong."