Sentence:  [T]o do one's best on Sunday to interweave that thought with the active life of an active town, and to inspirit both and make both infinite by glimpses of the Eternal Glory, seemed such an exquisite <WSD>forelook</WSD> into one's life! . . . If this vision could only have lasted. 
Meaning of the word marked with <WSD> tags:  A preview.