“At midnight on the Emperor’s pavement flit
Flames that no faggot feeds, nor steel has lit,
Nor storm disturbs, flames begotten of flame,
Where blood-begotten spirits come
And all complexities of fury leave,
Dying into a dance,
An agony of trance,
An agony of flame that cannot singe a sleeve.”

Source: The Tale of the Body Thief

Black Elk Speaks (1961)

By Still Waters (1906)
Context: When the lips I breathed upon
Asked for such love as equals claim
I looked where all the stars were gone
Burned in the day's immortal flame.
"Come thou like yon great dawn to me
From darkness vanquished, battles done:
Flame unto flame shall flow and be
Within thy heart and mine as one.".

Source: Sculpting in Time (1986), p. 57

Source: 1970s, Meditations (1979), p. 105
Context: Meditation is the emptying of the mind of all thought, for thought and feeling dissipate energy. They are repetitive, producing mechanical activities which are a necessary part of existence. But they are only part, and thought and feeling cannot possibly enter into the immensity of life. Quite a different approach is necessary, not the path of habit, association and the known; there must be freedom from these. Meditation is the emptying of the mind of the known. It cannot be done by thought or by the hidden prompting of thought, nor by desire in the form of prayer, nor through the self-effacing hypnotism of words, images, hopes, and vanities. All these have to come to an end, easily, without effort and choice, in the flame of awareness.

Attributed to Augustine by many sources on line, but without an actual reference.
Disputed