Well, I think the affirmation has to be related to something true that you tend to forget but is meaningful for you. Like for me, remembering that I am an adult and I am free to make a choice or I have the opportunity to make a choice in any given situation could be an affirmation that reminds me to be mindful and not treat the world as if I have no choice. This may be meaningless or even not true for some other people.

Also, would you agree with the statement, for yourself, "I am not intelligent"? No? Then you are intelligent sometimes, right? There must be something you can remind yourself about, if intelligence is important to you, of the ways or situations in which you are intelligent. I am intelligent about some things. Other things I am improving. Other things I am epic fail or don't want to think about it or should just give up trying, but that does not an affirmation make. In other words, I think you have to qualify it. I agree that if you are logically minded and not inclined to brush things under the carpet, then blanket affirmations of things that aren't true are not useful.

>I love and accept myself unconditionally. I don't really even understand what this means.

Maybe transform it to "I want to develop compassion for myself unconditionally." Acceptance relates to compassion, in one view.