What is the historical context of making the sign of the cross?

I always make the sign of the cross and a Protestant was asking where that came from. So I would like to educate myself and my protestant fried why we Catholics make the sign of the cross. I enjoy doing it and it reaffirms my commitment to Christ but I was wondering if you can give me more context that I can share with my friend.

Thanks.

The following link should be helpful for understanding the history of the Sign of the Cross. If you have any further questions or concerns that are not answered by these links, please contact Catholic Answers directly.

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