Who goes to warfare any time at his own expense? who plants a vineyard, and eats not of the fruit thereof? or who feeds a flock, and eats not of the milk of the flock?
All Commentaries on 1 Corinthians 9:7 Go To 1 Corinthians 9
John Chrysostom
AD 407
The apostleship was much more dangerous than being a soldier. For their warfare was not just with men but with demons as well. The apostles were both soldiers and husbandmen and shepherds, not of the earth, nor of irrational animals, nor in such wars as are perceived by the senses, but of rational souls and in battle array with the demons.