True Bahá'í by definition

He is a true Bahá'í who strives by day and by night to progress and advance along the path of human endeavour, whose most cherished desire is so to live and act as to enrich and illuminate the world, whose source of inspiration is the essence of divine virtue, whose aim in life is so to conduct himself as to be the cause of infinite progress. Only when he attains unto such perfect gifts can it be said of him that he is a true Bahá'í. For in this holy Dispensation, the crowning glory of bygone ages and cycles, true faith is no mere acknowledgement of the unity of God, but rather the living of a life that will manifest all the perfections and virtues implied in such belief.

'Abdu'l Bahá, translated by Shoghi Effendi and published in The Bahá'í World, vol. 2, "1925-1928"
The Compilation of Compilations vol II, p. 346)