So we should not be ashamed to acknowledge the Crucified. Let us not then be ashamed to confess the Crucified. We should boldly trace the cross with our fingers as a seal on our forehead and over everything: over the bread we eat, the cups we drink, when we come in and when we go out, before we go to sleep, when we go to bed and when we get up, on journeys, and at rest. It is a powerful protection; to suit the poor, it costs nothing; to suit the weak, it costs no labor, since it comes as a gift from God; it is a sign for the Faithful and a terror to demons. For 'in it he triumphed over them', 'openly making an example of them' (Col 2.15, adjusted). For when they see the cross, they remember the Crucifixion; they fear the one who crushed the dragon's heads (cf. Ps 73:14). Do not despise the seal because it is a free gift; no, honor the Benefactor all the more because of it.

- St Cyril of Jerusalem, Catechesis 13.36