There are two ways to read this quote.
Lincoln might be telling us to “accentuate the positive.” That managing our emotions and deciding to be happy will make us feel happy. In which case, this quote is kind of ironic, given that poor Abe struggled with depression. Seems like there’s a little self-loathing mixed into the words.
Here is the gift-giving credo that has given a pass to all manner of disappointing gifts, from “what were they thinking?” garments to “oh good, something to dust” tsotskes.
Our smiles might freeze on our faces as we rip the wrapping from a package, but whatever is within, we think, “It’s the thought that counts,” because that’s the nice thing to do when someone is nice enough to give us a gift, no matter how ill-conceived—or, frankly, how little thought appears to have actually been put into a gift.
For me, “it’s the thought that counts” has another meaning as well, which traps me in gift-giving OCD. “It’s the thought that counts,” so you have to put a lot of thought into every gift, strive for some sort of gifting nirvana. You have to peer into the souls of friends and loved ones and find the gift that will, if not complete them, at least set them on a path to happiness.