Who said "Weakness of spirit is the only true defeat."?

This quote is attributed to Worf.

Weakness of spirit is the only true defeat. - Worf

"Weakness of spirit is the only true defeat."

Worf

"I am a Klingon warrior. It is my duty to face death with honor."

"Today is a good day to die."

"Success is not measured by how many battles you win, but by how you conduct yourself in the struggle."

"Family is everything to a Klingon. Without honor, there is no family."