The best you are able to do today may not be the best you were able to do yesterday or could do tomorrow, it is however the best you are able to do now. So it is with everyone.
I leave you with this quote from the Shutei Hoyo Shiki.

“The way we are and the state of our mind in any moment is the relationship we experience with the Three Treasures. There is no distinction. We are either constantly bowing, or not bowing but always manifesting our relationship.”