You can't change who you are, but you can change what you have in your head, you can refresh what you're thinking about, you can put some fresh air in your brain.
I will grow. I will become something new and grand, but no grander than I now am. Just as the sky will be different in a few hours, its present perfection and completeness is not deficient, so am I presently perfect and not deficient because I will be different tomorrow. I will grow and I am not deficient.