"I have cast fire upon the world,
I am guarding it until it blazes."
The following quotes are from:
Your Word Is Fire,
The Hasidic Masters
On Contemplative Prayer
Edited and translated by Arthur Green
and Barry W. Holtz, 1977, Schocken Books
"When God is seated upon His throne,
a fire of silence falls upon
the heavenly beings."
When a person says the words of prayer
so that they become a throne for God
an awesome silent fire takes hold of him.
Then he knows not where he is;
he cannot see, he cannot hear.
All this happens in the flash of an instant-
as he ascends beyond the world of time.
Or Ha-Emet 2b.
A person at prayer is like a bed of coals,
As long as a single spark remains,
a great fire can again be kindled.
But without that spark there can be no fire.
Always remain attached to God,
even in those times
when you feel unable to ascend to Him.
You must preserve that single spark-
lest the fire of your soul be extinguished.
Liqqutim Yeqarim 15b; Keter Shem Tov 37b-38a.