Who said "The human element is always difficult to calculate."?

This quote is attributed to Spock.

The human element is always difficult to calculate. - Spock

"The human element is always difficult to calculate."

Spock Philosophy

"Logic is the beginning of wisdom, not the end."

"I have been, and always shall be, your friend."

"The needs of the many outweigh the needs of the few."

"Insufficient data for meaningful answer."

"I've seen the worst humanity has to offer."

"Sometimes I wonder if the world is worth saving."

"Every choice shapes our destiny."

"Order is the foundation of a good life."