God only knows what may happen; you never know what will happen
Proverb expressing uncertainty about the outcome of a risky or unpredictable situation; literally 'whether a demon or a Buddha will appear'.
In this match, you never know what will happen—I can't predict it at all.
A set phrase of uncertain origin; the contrast between 鬼 (demon) and 仏 (Buddha) symbolizes extreme opposite outcomes.