મન ઢોંગી મન ધૂર્ત હય, મન મેગલ સમાન;

mana ḍhōṁgī mana dhūrta haya, mana mēgala samāna;

Literally: The mind is a hypocrite, the mind is cunning, the mind is like a wild elephant;
What it means: The human mind is highly deceptive and unruly, acting as a friend if controlled but as a dangerous enemy if left unchecked.

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.