The man who has seen reality during a temporary glimpse may later be subjected to its hidden operation without or within. In this way the higher power tests him, tries his faith, courage, patience, and, above all, sense of truth and capacity for discrimination. If the test reveals his weakness, then it is for him to provide the remedy: thus in the end he is strengthened. It is not enough to recognize the Real in its own homeland alone; he must be trained to recognize it under all conditions, even when it is hidden under thick illusion, even in the lowest ebb of the soul's dark night. These tests, which come both from within and without, help to give this training.
-- Notebooks Category 23: Advanced Contemplation > Chapter 3: The Dark Night of The Soul > # 59