Gleanings — Paragraph 354
Source (Arabic)
ما کنز في قلب البهآء عمّا علّمه ربّه مالک الأسمآء لینصعق الّذین تراهم علی الأرض کم من
Translation
Oh, would that the world could believe Me! Were all the things that lie enshrined within the heart of Bahá, and which the Lord, His God, the Lord of all names, hath taught Him, to be unveiled to mankind, every man on earth would be dumbfounded.