1st Thessalonians 5:19
Quench not the Spirit.
[Quench not the Spirit.] The Holy Spirit is represented as a fire, because it is his province to enlighten and quicken the soul; and to purge, purify, and refine it. This Spirit is represented as being quenched when any act is done, word spoken, or temper indulged, contrary to its dictates. It is the Spirit of love, and therefore anger, malice, revenge, or any unkind or unholy temper, will quench it so that it will withdraw its influences; and then the heart is left in a state of hardness and darkness. It has been observed that fire may be quenched as well by heaping earth on it as by throwing water on it; and so the love of the world will as effectually grieve and quench the Spirit as any ordinary act of transgression.
(from Adam Clarke's Commentary, Electronic Database. Copyright (c) 1996 by Biblesoft)