"Address your argument to cowards and knaves"

That is what I said to someone who said, "TO, I think we are going to lose this one, and I fear for the country."

Here is the full context of the quote: "Address that argument to cowards and to knaves; with the free and the brave it will effect nothing. It may be true; if it must, let it...The probability that we may fall in the struggle ought not to deter us from the support of a cause we believe to be just...Let none falter, who thinks he is right, and we may succeed. But if after all, we shall fail, be it so."

Who said that? Abraham Lincoln when people questioned his support for William Henry Harrison in 1840. Interestingly, Harrison improbably won that election because of stalwarts like Lincoln.