Published in 1926, but with artwork pre-dating 1917, whose copyright has expired. An expired copyright means that you are free to use these photos in whatever capacity you wish, except you may not link to them at this site.
I want to strike a blow at the lazy, easy, sleepy Christianity of these latter days, which can see no beauty in zeal, and only uses the word “zealot” as a word of reproach… Zeal in religion is a burning desire to please God, to do His will, and to advance His glory in the world in every possible way. It is a desire which no man feels by nature – which the Spirit puts in the heart of every believer when he is converted, but which some believers feel so much more strongly than others that they alone deserve to be called “zealous” men. This desire is so strong, when it really reigns in a man, that it impels him to make any sacrifice, to go through any trouble, to deny himself to any amount, to suffer, to work, to labor, to toil, to spend himself and be spent, and even to die, if only he can please God and honor Christ.
J.C. Ryle