How do you know the being that you are communicating with through your tool of Divination is benevolent?

My primary tool of Divination is the I-Ching and I have recently discovered that a negative entity has been hijacking the conversation and misleading me. I now protect my divinatory tools with salt water. I also ask the entity if it negative, if the answer is yes I do a ritual consisting of visualization and prayers to get rid of it. Often i have to repeat this ritual several times before the entity leaves.