Who is Acarya?

“One who follows religious principles and teaches others is an acarya. One cannot become an acarya by simply creating arguments and thereby making worldly advancement. Those who have been entrusted with the responsibility of being acaryas in the Gaudiya Vaisnava-sampradaya should try to remove all anarthas from their sampradaya.” (Bahaktivinoda Thakura in Sajjana-tosani 4/1)