In paragraph 9, what the phrase "drew him on by artful questions" means is that he questioned him to try to gain privileged information.
He had to find out some information that was very important to him, so he started questioning him furtively so as to get to the bottom of things.
Change "it" to "this interior"
It is a colon
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<em>Christlike staying power in romance and marriage requires more than any of us really have. It requires something more, </em><em>an endowment from heaven.</em>
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This is the complete quote from the author Elder Jeffrey R. Holland, american, religious educator in which he pretends to make the reader conscious of the implications of being a Christian and what it is needed. By saying "it requires something more" he is referring that it it not as easy as wanting and trying. Because it is bigger than us, humans.