કર્મમાં જે લેખ લખ્યા, તે મિથ્યા નવ થાય;

karmamāṁ jē lēkha lakhyā, tē mithyā nava thāya;

Literally: The writings written in destiny never become false;
What it means: Whatever is destined to happen will inevitably occur, as fate can turn a beggar into a king or a king into a beggar.

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.