The Aqdas, the unerring Balance

Weigh not the Book of God with such standards and sciences as are current amongst you, for the Book itself is the unerring Balance established amongst men. In this most perfect Balance whatsoever the peoples and kindreds of the earth possess must be weighed, while the measure of its weight should be tested according to its own standard, did ye but know it.

Baha'u'llah, The Kitab-i-Aqdas, p. 56 paragraph 99