The Sign of the Cross

I still enjoy reading A Biblical Walk Through The Mass by Edward Sri The Introductory Rites page 23: The Sign of the Cross

The theologian Tertullian (c. AD 160-225), for example, described the common practice of believers who marked themselves with the Sign of the Cross throughout the day:

‘In all our travels and movements, in all our coming in and going out, in putting on our shoes, at the bath, at the table, in lighting our candles, in lying down, in sitting down, whatever employment occupies us, we mark our foreheads with the sign of the cross.”