Sentence:  The third great age of humanity ("das Reifalter") is that in which all its powers are fully and harmoniously developed... and in which <WSD>panentheism</WSD> is universally and cordially accepted as the only true and adequate doctrine either of science or of society. 
Meaning of the word marked with <WSD> tags:  A doctrine that the universe subsists within God, but that God nevertheless transcends or has some existence separate from the universe.