Adam Clarke on Acts 10:7

And a devout soldier - It has already been remarked that Cornelius had taken care to instruct his family in Divine things; and it appears also that he had been attentive to the spiritual interests of his regiment. We do not find that it was then, even among the Romans, considered a disgrace for a military officer to teach his men lessons of morality, and piety towards God, whatever it may be in some Christian countries in the present time.