And it came to pass, when Moses held up his hand, that Israel prevailed: and when he let down his hand, Amalek prevailed.
All Commentaries on Exodus 17:11 Go To Exodus 17
Gregory the Theologian
AD 390
For my own warfare, however, I am at a loss what course to pursue, what alliance, what word of wisdom, what grace to devise, with what panoply to arm myself against the wiles of the wicked one. What Moses did is to conquer him by stretching out his hands upon the mount, in order that the cross, thus typified and prefigured, may prevail.