As regards …’s claim to have direct revelation from God; such visions and communications as he may receive cannot, from the standpoint of the Cause, be well considered in the nature of a direct and authoritative revelation from God such as experiences by Divine Prophets and Messengers. There is a fundamental difference between Divine Revelation as vouchsafed by God to His Prophets, and the spiritual experiences and visions which individuals may have. The latter should, under no circumstances, be construed as constituting an infallible source of guidance, even for the person experiencing them. The Guardian wishes you to fully explain and clarify this point to … that he may have no illusion regarding the true Bahá’í attitude on this and similar matters.
(Shoghi Effendi, Lights of Guidance, p. 514)