Who said "A man must be steadfast in his purpose."?

This quote is attributed to Mountain.

A man must be steadfast in his purpose. - Mountain

"A man must be steadfast in his purpose."

Mountain Leadership

"I am the Mountain."

"The strong do what they can, and the weak suffer what they must."

"Ours is the fury."

"A man's worth is measured by his strength."

"A leader must be fair and just."

"Integrity is everything."

"One must take responsibility for one's environment."

"In this house, I make the decisions"