Part a read these sentences from paragraph 2 of the passage. these words sank deep into my heart, stirred up sentiments within that lay slumbering, and called into existence an entirely new train of thought. it was a new and special revelation, explaining dark and mysterious things, with which my youthful understanding had struggled, but struggled in vain. i now understood what had been to me a most perplexing difficulty—…. which definition best expresses the connotative meaning of the word youthful as the author uses it in the second sentence?