Love is kindled in a flame, and ardency is its life. Flame is the air which true Christian experience breathes. It feeds on fire; it can withstand anything rather than a feeble flame; but when the surrounding atmosphere is frigid or lukewarm, it dies, chilled and starved to its vitals. True prayer must be aflame.

Necessity of Prayer (ed. CCEL, 2011) - ISBN: 9781610250009