Though he has no form my eyes saw him, his glory is fire in my mind that knows
It pervades the entire universe but nothing pervades it. It is effulgent by nature, and its splendor illumines everything...
But it is only when all outward appearances are gone that there is left that one principle of life which exists independently of all external phenomena. It is the fire that burns in the eternal light, when the fuel is expended and the flame is extinguished; for that fire is neither in the flame nor in the fuel, nor yet inside either of the two, but above, beneath, and everywhere.
All manner of thing shall be well When the tongues of flames are in-folded Into the crowned knot of fire And the fire and the rose are one.
This is an account written by Norris Stearns of Greenfield, Massachusetts, published in 1815, five years before Joseph Smith's First Vision experience, in a pamphlet titled The Religious Experience Of Norris Stearns Written by Divine Command. The 35 page pamphlet can be read in its entirety online at this link. Here is an excerpt of part of his vision.
My experience of stillness, or transcendental consciousness, has become vast and universal, often blazing with intensely brilliant, even blinding, light. Words cannot even begin to describe the intensity of bliss and the tenderness of emotions that not only swell in my heart, but penetrate into every pore of my being. Is this an experience of God?