Sentence:  When we see the <WSD>steady</WSD> and methodical inculcation into humanity of the idea of man 's worthlessness - until redeemed - the necessity of the Devil may become evident as a weapon , a weapon designed and used time and time again in every age to whip men into a surrender to a particular church or church-state '' . 
Meaning of the word marked with <WSD> tags:  not subject to change or variation especially in behavior