કહેતાણી દિવાના, સુનતાણી દિવાના.

kahētāṇī divānā, sunatāṇī divānā.

Literally: The speaker is a fool, the listener is a fool.
What it means: Said of a pointless conversation where neither party understands the other.

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.