કવિતા ને કસ્તૂરી સાક્ષી વિના સિદ્ધ થાય.

kavitā nē kastūrī sākṣī vinā siddha thāya.

Literally: Poetry and musk are proven without witnesses.
What it means: True quality or talent is self-evident and needs no external validation.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1923) ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1921) · 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.