September 1

…infallibility in essence is confined to the universal Manifestations of God, and infallibility as an attribute is conferred upon sanctified souls. For instance, the Universal House of Justice, if it be established under the necessary conditions—that is, if it be elected by the entire community—that House of Justice will be under the protection and unerring guidance of God. Should that House of Justice decide, either unanimously or by a majority, upon a matter that is not explicitly recorded in the Book, that decision and command will be guarded from error. Now, the members of the House of Justice are not essentially infallible as individuals, but the body of the House of Justice is under the protection and unerring guidance of God: This is called conferred infallibility. 
- ‘Abdu’l-Baha  (Table talks in Akka, authenticated by ‘Abdu’l-Baha; ‘Some Answered Questions’ – 2014 revised translation by the Baha’i World Centre)