"Prior to the 17th century the terms ["deism" and "deist"] were used interchangeably with the terms "theism" and "theist", respectively. … Theologians and philosophers of the seventeenth century began to give a different signification to the words.... Both [theists and deists] asserted belief in one supreme God, the Creator.... and agreed that God is personal and distinct from the world. But the theist taught that god remained actively interested in and operative in the world which he had made, whereas the deist maintained that God endowed the world at creation with self-sustaining and self-acting powers and then abandoned it to the operation of these powers acting as second causes."