Answer:
"Andrew says this because he had been able to keep his promise given to Joe Morgan; he had been able to save Mrs. Morgan as well as his newly born baby after it had been born lifeless. It means Andrew felt contented and jubilant at his own efforts and the achievement."
In the final ten lines of the poem Il Penseroso, the poet aspires to a revelation of devine knowledge to inspire his great poetry. He will devote himself to solitude, contemplating. Among these lines he speaks about sitting in a "peacful hermitage" where "rightly spell" may refer to attachment to natural madic and an interest i the new search for an accurate scientific language. He wants to know and understand nature.
Taking a shower before bed, in comparison to the other answers, doesn’t really matter.
