It is proof of a base and low mind for one to wish to think with the masses or majority, merely because the majority is the majority. Truth does not change because it is, or is not, believed by a majority of the people.

Included as a quotation in The Great Quotations (1977) by George Seldes, p. 35, this appears to be a paraphrase of a summation of arguments of Bruno's speech in a debate at the College of Cambray (25 May 1588) which are not clearly presented as a direct translation of his statements

In an inspired speech Bruno, through the interpreter, Jean Hennequin, of Paris, declared the discovery of numberless worlds in the One Infinite Universe. Nothing was more deplorable, declared he, than the habit of blind belief, for of all other things it hinders the mind from recognizing such matters as are in themselves clear and open. It was proof of a base and low mind for one to wish to think with the masses or majority, merely because the majority is the majority. Truth does not change because it is, or is not, believed by a majority of the people. However, he cautioned that they should not be influenced by the fervor of speech, but by the weight of his argument and the majesty of truth. | Coulson Turnbull in Life and Teachings of Giordano Bruno: Philosopher, Martyr, Mystic 1548 — 1600 (1913), p. 41