Each generation of Christians must look to its beliefs. While truth itself is unchanging, the minds of men are porous vessels out of which truth can leak and into which error may seep to dilute the truth they contain. The humanheart is heretical by nature and runs to error as naturally as a garden to weeds. All a man, a church or a denomination needs to guarantee deterioration of doctrine is to take everything for granted and do nothing. The unattended garden will soon be overrun with weeds; the heart that fails to cultivate truth and root out error will shortly be a theological wilderness; the church or denomination that grows careless on the highway of truth will before long find itself astray, bogged down in some mud flat from which there is no escape.