Sentence:  Such a man "can do all things through Christ that strengtheneth him", he can patiently suffer all things with cheerfull submission and resignation to the Divine Will. He has a secret <WSD>Spring</WSD> of spiritual Joy, and the continual Feast of a good Conscience within, that forbid him to be miserable. 
Meaning of the word marked with <WSD> tags:  The source from which an action or supply of something springs.