Thief of Time Terry Pratchett
The problem with working with glass was working with glass.
The need to polish and wash away any evidence of touch, the need to try to see the intricate, nimble work around the transparency, the need to make new contacts where one didn't want new contacts to find glass to bend and to turn and to do everything glass shouldn't do.
To blow glass took lung power beyond the capacity of a small chest; to bend it took far more experienced hands. But there was no time to ponder about qualifications and insecurities and needs.
The need to let the beloved pieces out front go undusted and unwound until they became nothing more than decorations upon the wall, and silent ones at that. Silence on the hour was deafening, and it would shake mere mortals down to the core.
When passion and obsession gives way to all help being poured down the sink, when madness isn't madness if it was justified with shouting, you were left with perfection.
And one must always work for perfection.