The first is that increasing the number of priests means that there is less dignity in being a priest. The second reason is that it is so difficult to find people good enough to become priests. When Utopia is at war, some of the priests join the army and pray during battle. First they pray for peace, and then for victory, with as little bloodshed as possible. The priests are revered by all nations, and have been known to stop unnecessary bloodshed in war.
Utopians measure their months by the lunar cycle, and their years by the solar cycle.
Since there are many different forms of religion, the priests are only allowed to share in the temples what is common in all religions. Also, there are no images of God in the temples so that each person can imagine Him as he wishes. At the evening of the festival that concludes each season, the priests meet in their temples and thank God for what he has given them that year or month. They do not sacrifice any animal in this festival, as they do not think that it is right to take pleasure in killing something that God has given them. Instead, they burn incense and other sweet odors and light candles.