"4. Q. Would you call a person a Buddhist who had merely been born of Buddha parents? A. Certainly not. A Buddhist is one who not only professes belief in the Buddha as the noblest of Teachers, in the Doctrine preached by Him, and in the Brotherhood of Arhats, but practises His precepts in daily life."
January 1, 1970
https://en.wikiquote.org/wiki/Henry_Steel_Olcott