The Hosts
The Hosts are an important part of the testificate culture, and they worship all three at any given time, as it is believed that only one without the others will bring more tragedy than fortune.
Action without any foresight or knowledge will bring disaster...Foresight without knowledge or action will birth hopelessness...Knowledge without foresight or action is just useless.
Same goes for two without the third. Action and knowledge without foreseeing what happens, knowledge and foresight without action... y'know.
It's considered more respectful to call the Hosts by their titles. Mother Foresight, Sister/Brother Action, and Son Knowledge.
Foresight is the all-seeing Mother. She is a Mother that will tell you the consequences of your action, a Mother that will guide you to experience the world in a safe way.
Action is the older Sibling that will help you walk, the Sister that will give you the courage to befriend and the Brother that will teach you self defense in times of danger. She's the younger Sister you aspire to protect, He's the Baby Brother you make food for.
And Knowledge, He's the child you raise and grow. He's forever juvenile, as you can't find any stop to growing your information. He's the kid that will drag you around, The child that will ask you questions you don't have answers to, the son that encourages you to continue learning. It's also why he's the most humanoid of all four three.
Anyway, while worshipping all three is the norm, many find themselves devoted to one more than the others.
Writers and researchers praying to The Son to get their spark of curiosity, clerics and travelers pleading to The Mother to guide them through their choices and hard times, blacksmiths and cooks putting their trust in the Sibling to continue to work for good.