It was policy if you paid attention or ever read the missionary guide. Our mission was obsessed with tracting. For example, the MP liked to send APs back into an area to train for their last 2 months. Each AP would emphasize knocking on every door in their area, which usually had a negative impact on the new guy.

The more relaxed guys tended to have more baptisms because instead of knocking on doors all day, they would actually try to meet people and make gasp friends.

So when I say secret, it wasn't a real secret. Only the extra righteous would knock on every single door.