Sentence:  <WSD>Eternity</WSD> has generally been considered as divisible into two parts; which have been termed, <WSD>eternity</WSD> "a parte ante", and <WSD>eternity</WSD> "a parte post": that is, in plain English, that <WSD>eternity</WSD> which is past, and that <WSD>eternity</WSD> which is to come. 
Meaning of the word marked with <WSD> tags:  Existence without end, infinite time.