It's from a speech he gave to congress. Do you expect Lincoln to sign speeches he wrote for himself?
You can grasp for straws that this is not an authentic statement from Lincoln, but the truth is that it is.
And you gloss over a pre-Civil war letter to someone you say is in 1848. Look, you’re just pissed because of another thread we tangled on. I get that. But I don’t go looking for ANYTHING you’ve posted and ache to contract what you say. You’re just not that important.