Answer by taking a quote from the following article:

Joshua Lawrence Chamberlain (born Lawrence Joshua Chamberlain, September 8, 1828 - February 24, 1914) was an American college professor from the State of Maine, who volunteered during the American Civil War to join the Union Army. He became a highly respected and decorated Union officer, reaching the rank of brigadier general (and brevet major general). He is best known for his gallantry at the Battle of Gettysburg, for which he was awarded the Medal of Honor. Chamberlain was commissioned a lieutenant colonel in the 20th Maine Volunteer Infantry Regiment in 1862 and fought at the Battle of Fredericksburg.

Chamberlain was born in Brewer, Maine, the son of Sarah Dupee (nee Brastow) and Joshua Chamberlain on September 8, 1828. Chamberlain was of English ancestry, and could trace his family line back to twelfth century England, during the reign of King Stephen. He was the oldest of five children. It is said that he was his mother's favorite while his father was tough on him. He was very involved in his church, mostly singing in the choir. His mother encouraged him to become a preacher while his father wanted him to join the military, but he felt a reluctance towards both options. He suffered a speech impediment until shortly after graduating from Bowdoin College. He entered Bowdoin College in Brunswick, Maine, in 1848 with the help of a local tutor, professor William Hyde. Chamberlain learned to read Ancient Greek and Latin in order to pass the entrance exam. While at Bowdoin he met many people who would influence his life, including Harriet Beecher Stowe, the wife of Bowdoin professor Calvin Stowe. Chamberlain would often go to listen to her read passages from what would later become her celebrated novel, Uncle Tom's Cabin. He also joined the Peucinian Society, a group of students with Federalist leanings. A member of the Phi Beta Kappa academic honor society and a brother of the Alpha Delta Phi fraternity, Chamberlain graduated in 1852.  He married Fanny Adams, cousin and adopted daughter of a local clergyman, in 1855, and they had five children, one of whom was born too prematurely to survive and two of whom died in infancy. Chamberlain studied for three additional years at Bangor Theological Seminary in Bangor, Maine, returned to Bowdoin, and began a career in education as a professor of rhetoric. He eventually went on to teach every subject in the curriculum with the exception of science and mathematics. In 1861 he was appointed Professor of Modern Languages. He was fluent in nine languages other than English: Greek, Latin, Spanish, German, French, Italian, Arabic, Hebrew, and Syriac.  Chamberlain's great-grandfathers were soldiers in the American Revolutionary War. One, Franklin Chamberlain, was a sergeant at the Siege of Yorktown. His grandfather, also named Joshua Chamberlain, was a colonel in the local militia during the War of 1812 and was court-martialed (but exonerated) for his part in the humiliating Battle of Hampden, which led to the sacking of Bangor and Brewer by British forces. His father also had served during the abortive Aroostook War of 1839.

Which of the advice does he go for?
he felt a reluctance towards both options.