(1) A quote from The Art and Craft of Stained Glass by E.W. Twining:

“To be able to design for glass, in colour, a beautiful figure, perfectly proportioned, gracefully posed and draped in a suitable setting is a fine thing. To be able to do the same with a number of figures grouped in a well balanced composition is a glorious achievement indeed, but to be able to do this latter and then carry the design through to its ultimate end places the artist in the very front rank of his profession. It has been said, and I think truly, that stained glass is either a trade or an art, according to whether the various portions of the craft are divided up amongst a number of operatives or whether it is carried through by one brain and pair of hands.”

(2) British Society of Master Glass Painters

(3) Tracery Tales – Exploring History, Architecture and Culture – One Adventure At A Time

The image is a scan from The Art and Craft of Stained Glass