Among Bahá’u’lláh’s “signs”: - “the sublimity of His grandeur, His exalted state, His towering glory”; “ the extraordinary things He continually did, the miracles He performed, the wonders appearing from Him without interruption”

And among His [Baha’u’llah’s] signs is the sublimity of His grandeur, His exalted state, His towering glory, and the shining out of His beauty above the horizon of the Prison: so that heads were bowed before Him and voices lowered, and humble were the faces that turned His way. This is a proof never witnessed in the ages gone before.

Again among His signs are the extraordinary things He continually did, the miracles He performed, the wonders appearing from Him without interruption like the streaming down of His clouds -- and the acknowledgement, even by unbelievers, of His powerful light. By His own life! This was clearly verified, it was demonstrated to those of every persuasion who came into the presence of the living, the self-subsisting Lord. 

- ‘Abdu'l-Baha ('Selections from the Writings of ‘Abdu'l-Baha')

“This is the age of the Blessed Perfection [Bahá’u’lláh]

Do ye know in what cycle ye are created and in what age ye exist? This is the age of the Blessed Perfection and this is the time of the Greatest Name! This is the century of the Manifestation, the age of the Sun of the Horizons and the beautiful springtime of His Holiness the Eternal One! 

- ‘Abdu'l-Baha (‘Baha'i World Faith’)