Acts 10:2 - Matthew Poole's English Annotations on the Holy Bible

A devout man; this Cornelius was a proselyte of the gate, or such as observed the seven precepts of Noah, and lived without giving any offence to the Jews. With all his house; it was a very good sign that he feared God, in that he engaged all his house to do the like, at least outwardly, which was as much as he could do: this was spoken by God in Abraham's commendation, Genesis 18:19. Prayed to God alway; he did not neglect the seasons of prayer, especially the time of offering the morning and evening sacrifice, which by prayer they desired to partake the benefit of by which Christ our sacrifice, and his merits, were figured unto them. Cornelius indeed prayed always, or at all times, taking time in a moral sense, for the seasons and opportunities for such a duty; (as we are commanded to give thanks always, Ephesians 5:20); but he could not pray always, or at all times, taking time in a natural sense, for then he must have neglected all other duties; however, his endeavour was to keep his heart always in a praying disposition.