Sentence:  In the history of Christian <WSD>mysticism</WSD> the problem how to discriminate between such messages and experiences as were really divine miracles, and such others as the demon in his malice was able to counterfeit, thus making the religious person twofold more the child of hell he was before, has always been a difficult one to solve, needing all the sagacity and experience of the best directors of conscience. 
Meaning of the word marked with <WSD> tags:  A doctrine of direct communication or spiritual intuition of divine truth.