A Buddha Prayer (from the Pali Canon)
Fritz Perls based The Gestalt Prayer from Buddha's teachings:
Do not hark back to things that passed,
And for the future cherish no fond hopes;
The past was left behind by thee,
The future state has not yet come.
But who with vision clear can see
The present which is here and now
Such wise one should aspire to win
What never can be lost or shaken.