* The belief in the existence of matter ''and'' the existence of X does not preclude one from studying matter. In other words, one's ability to observe and study the material world does not require one to deny the existence of any other, non-material reality; | * The belief in the existence of matter ''and'' the existence of X does not preclude one from studying matter. In other words, one's ability to observe and study the material world does not require one to deny the existence of any other, non-material reality; |