The history of the past demonstrates clearly that there are certain times when the cults become an exceptional danger. This is always the case in times of crisis and of trouble, times of war or the threat of war. There is no difficulty in understanding why this is so from the mere standpoint of psychology. Whenever men are hard pressed or in trouble, they always want to find relief, help, comfort and guidance. That provides the opportunity for the wiles of the devil in the form of cults. This happens also, of course, in times of bereavement, sorrow, or ill-health, or in the event of some mishap in life, or some business anxiety or worry, or anything that makes life difficult for men and women. Under such conditions the cults tend to flourish and to thrive.
D. Martyn Lloyd-Jones, “The Christian Warfare: An Exposition of Ephesians 6:10-13,” pg.123