App for custom affirmation?

[nexgen]

I have searched a lot but only found apps with built in affirmations. Can you please recommend any app which allow me to enter/edit my own affirmation?

[nexgen]

I think I haven't clarified my need enough. Here is what I mean by affirmation:

I usually read lots of book and I like to remind myself regarding lots of my bad habits so that I can improve them. One excellent way for this is to write down the positive thought you have and review them daily.

For example, here are something I want to get reminded:
* Drink 3 ltrs of water daily
* Walk with confidence
etc.. etc..

I want to write down all these in my iphone and the app should show this to me randomly whenever I tap on the screen.

Let's say, in the future I have started doing what I have written then I should be able to mark it as done and the app shouldn't show that affirmation again.

The app which closely match to my need is MyThoughts but unfortunately it is poorly designed. So, I'm looking for something much better.