The reason why privacy hath been enjoined in moments of devotion is this, that thou mayest give thy best attention to the remembrance of God, that thy heart may at all times be animated with His Spirit, and not be shut out as by a veil from thy Best Beloved. Let not thy tongue pay lip service in praise of God while thy heart be not attuned to the exalted Summit of Glory, and the Focal Point of communion. Thus if haply thou dost live in the Day of Resurrection, the mirror of thy heart will be set towards Him Who is the Day-Star of Truth; and no sooner will His light shine forth than the splendour thereof shall forthwith be reflected in thy heart. For He is the Source of all goodness, and unto Him revert all things. But if He appeareth while thou hast turned unto thyself in meditation, this shall not profit thee, unless thou shalt mention His Name by words He hath revealed. For in the forthcoming Revelation it is He Who is the Remembrance of God, whereas the devotions which thou art offering at present have been prescribed by the Point of the Bayan, while He Who will shine resplendent in the Day of Resurrection is the Revelation of the inner reality enshrined in the Point of the Bayan--a Revelation more potent, immeasurably more potent, than the one which hath preceded it.
(The Báb, ‘Selections from the Writings of the Báb; The Compilation of the Compilations, Vol. II, The Importance of Prayer, Meditation, and the Devotional Attitude)
