He told that little girl one day she's going to understand.
One day she's going to read the letter and finally read the truth that was hiden behind lies for all of those days.
One day she will understand.

She said, i want that one day to be today, i don't want it to be tomorrow or days later because she's been waiting her whole life for answers. She's been waiting to see what you have to say. Waiting to see if this so called "truth" isn't a lie anymore.

She's always been waiting.
Waiting is apart of her now.
Don't let her down by giving her false hope. .