as far as I can decode, it says 行菩院了心日定霧 the 2nd and last chinese character isn't contemporary( in japanese) so I'm guessing but I'm pretty sure this is what's written.
As for meaning, it could be a name of a high rank monk, or a one-line sentence. the 3rd letter is often used as 'temples' so 行菩院 could be the name of the temple.
individual meaning of the characters
了-finish/ completion /understanding
If this rings any bells and anyone can figure out any concrete information from this, I'd be ever grateful!