Back in the mists of time - crossing your fingers - was used to ask for Gods protection and to wish for good luck. It was also used in order to allow early Christian believers to recognize one another during times of persecution. Some people - mostly children - also use the gesture to excuse their telling of a white lie. This may have its roots in the belief that the power of the Christian cross might save one from being sent to hell for telling a lie.
Whatever the reasons - I think we can all say that at one time or another in our lives - we have crossed our fingers for luck.
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