GKC: Art and Science point to the Resurrection

As a matter of fact, of course, there are a great many other languages besides the verbal. Descriptions of spiritual states and mental purposes are conveyed by a variety of things, by hats, by bells, by guns, by fires on a headland, or by jerks of the head. In fact there does exist an example which is singularly analogous to decorative and symbolic painting. This is a scheme of Esthetic signs or emblems, simple indeed and consisting only of a few elemental colours, which is actually employed to convey great lessons in human safety and great necessities of the commonwealth. It need hardly be said that I allude to the railway signals. They are as much a language, and surely as solemn a language, as the colour sequence of ecclesiastical vestments, which sets us red for martyrdom, and white for resurrection. For the green and red of the night-signals depict the two most fundamental things of all, which lie at the back of all language. Yes and no, good and bad, safe and unsafe, life and death.
[GKC George Frederick Watts 45]

The Apostles' Creed is not regarded as a pose of foppish vanity; yet the word "I" comes before even the word "God." The believer comes first; but he is soon dwarfed by his beliefs, swallowed in the creative whirlwind and the trumpets of the resurrection.
[GKC The Uses of Diversity 242]

Just in case the point is somehow not so clear, I will put it a bit more dramatically, as he himself did, from his deathbed. --Dr. Thursday.

"The issue is now quite clear. It is between light and darkness and every one must choose his side."
[quoted in Maisie Ward, Gilbert Keith Chesterton 650]