new thought to believe

I’m beginning with March homework now. My new thought is “I will write my book and get it published.” Is this an appropriate thought even though I don’t have control over it being accepted by a publishing company? Should the thought only be things we can control?

Also, does the tense matter? As in “I will write.” or “I have finished and published.” or “I am writing and publishing.” I write books and get them published?

I started this morning. so far today I have written more than I have in a long while. I feel so good. Thanks!