One day of days ...

In one of His letters, Bahá’u’lláh refers to a vision that He had in the Ridván Garden:

Newly renovated  Ridván Garden

"One day of days We repaired unto Our Green Island. Upon Our arrival, We beheld its streams flowing, and its trees luxuriant, and the sunlight playing in their midst. Turning Our face to the right, We beheld what the pen is powerless to describe; nor can it set forth that which the eye of the Lord of Mankind witnessed in that most sanctified, that most sublime, that blest, and most exalted Spot. Turning, then, to the left We gazed on one of the Beauties of the Most Sublime Paradise, standing on a pillar of light, and calling aloud saying: 'O inmates of earth and heaven! Behold ye My beauty, and My radiance, and My revelation, and My effulgence. By God, the True One! I am Trustworthiness and the revelation thereof, and the beauty thereof. I will recompense whosoever will cleave unto Me, and recognize My rank and station, and hold fast unto My hem. I am the most great ornament of the people of Baha, and the vesture of glory unto all who are in the kingdom of creation. I am the supreme instrument for the prosperity of the world, and the horizon of assurance unto all beings.' Thus have We sent down for thee that which will draw men nigh unto the Lord of creation."

Tablets of Bahá'u'lláh