Who knows much of our zeal is strange fire!
Ofttimes people conjecture over how to prosper the Lord’s Work and to please God: such conjecturing is all according to their fleshly thoughts without themselves having been dealt with by the Cross or having had their cleverness denied.
Zeal yes, but NOT of God.
It indeed is fire, but it is a foreign fire instead of altar fire.
Whatever does not come from the Cross, that is to say, from the self-denying altar, is merely strange fire.