Not only that, but also, it is an oxymoron!

think about it - if you approved of yourself and if you felt great about yourself, would you be uttering affirmations or would you be doing other things with your time?..

See - they do not make sense. And you have too much of a rational, critical thinker side to you (per posts on here) to make affirmations work. If your wife likes them, then great, and more power to her, but you should feel free not to try to use the things that make no sense to you (and, in this particular example - not saying anything about affirmations in general), they make no sense in themselves. They are nonsensical.