There are many gods, but all share this one characteristic—their words must be truth. If a god says what is already true, it spends no power. If a god says what is currently untrue, its speaking must make those words truth. If making that truth takes more power than a god has, that god will be drained, injured, even possibly killed. This is true of every god, from the smallest, least significant, to the most powerful. Anything a god utters is a binding promise. Gods are therefore generally careful with their words.