yad yad ãcarati…

yad yad ãcarati śreşţhas tat tad evetaro janaḥ
sa yat pramãņaṁ kurute lokas tad anuvartate

Whichever and however a great personality conducts himself common men follow; whatever he accepts as authority that and that alone certainly all the world will follow. Therefore, a leader must preach what he is taught and teach as he preaches.

Bhagawad Gita, Chapter 3, Verse 21