A "ninja poem" from “The Secret Traditions of the Shinobi, Hattori Hanzo’s Shinobi Hiden and other Ninja Scrolls”, Edited and Translated by Antony Cummins and Yoshie Minami, page 147.
Make yourself resolute with the idea that you will win whenever you go on a shinobi mission, and you can succeed, even if it is not realistic.
(This is a reoccurring theme in Japanese martial thought. Samurai ethics often talk of the "way of life and death" and to never hesitate when there is a choice of life or death. This premise is also supported in the Shoninki, and we can conclude that all references to this way of thinking indicate that as a warrior you should go forth with pride, confidence, and direction. This attitude will lead to success, and the opposite approach will result in failure.
This poem is also in the eleventh volume of the Bansenshuki.)