ગેર પરણાવી આપે, પણ ઘર ચલાવી આપે નહીં.

gēra paraṇāvī āpē, paṇa ghara calāvī āpē nahīṁ.

Literally: The priest gets you married, but he does not run your household.
What it means: Intermediaries can initiate a relationship or transaction, but managing its long-term success is up to the individuals involved.

Also said as

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.