તનકું જોગી સબ કરે, મનકા કરે ન કોય;

tanakuṁ jōgī saba karē, manakā karē na kōya;

Literally: Everyone makes the body an ascetic, but no one makes the mind one;
What it means: It is easy to adopt the outward appearance of a monk, but extremely difficult to discipline the mind.

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.