Who said "The truth is a blade that cuts both ways."?

This quote is attributed to Shallan Davar.

The truth is a blade that cuts both ways. - Shallan Davar

"The truth is a blade that cuts both ways."

Shallan Davar Truth

Character in The Way of Kings

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"I wish I could see the future."

"The parshmen are slaves, but they need not be."

"Words matter. Choose them carefully."

"Justice demands action."

"Lucy, you got some 'splainin' to do!"

"You must always be honest with the people you love."

"Truth always comes out in the end."

"Honesty is always the best policy."