Who said "Imagination is the first weapon against despair."?

This quote is attributed to Sif.

Imagination is the first weapon against despair. - Sif

"Imagination is the first weapon against despair."

Sif Imagination

"I have waited lifetimes for this moment."

"A warrior's heart beats strongest in battle."

"We are bound by more than just duty."

"The past shapes who we become."

"Imagination is more powerful than knowledge."

"The world is full of wonders if you know where to look."

"You have the imagination of a child, Lucy"

"The world is full of mysteries waiting to be solved."