Sentence:  Christianity is operating among them in two ways;  it exhibits its own glorious life amidst the decadence of antique idolatries, they grow old, and are stricken by the touch of ever-changing time, while Christianity puts forth the vitality and vigour of perennial youth; and while it is itself <WSD>lifeful</WSD>, and healthful as it is beautiful, it is gradually contributing to the decay of all the old superstitions that yet stand in ponderous and gloomy magnitude around it. 
Meaning of the word marked with <WSD> tags:  Bestowing life; enlivening. (from 13th c.)