Do we need a to here?

Although some individuals have called Cayce a “prophet” he himself made no such claims. In fact in one reading he described himself as a “lowly, weak, unworthy channel” (254-76). He rarely made any predictions about worldwide events, mostly because these kinds of predictions are subject to countless outside influences. For example, when psychics try to “predict” the future, all they can actually do is foretell a possible future based on current happenings. If events continue to occur along the same course – if people’s attitudes, lifestyles, and world conditions remain the same – then psychics can “see” what the result will be. However, the readings make it quite clear that each of us has the gift of free will. If enough people use their free will and change what they are currently doing, this in turn will have dramatic effects on the future.