મન જાવે તો જાન દે, મત દે જાને શરીર;

mana jāvē tō jāna dē, mata dē jānē śarīra;

Literally: If the mind wants to go, let it go, but do not let the body follow it.
What it means: One must maintain physical self-control and discipline even when the mind wanders or succumbs to temptation.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1923) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.