In ancient Greece, only barbarians drank their wine neat. A civilized symposium began with a krater, a large mixing bowl where wine was cut with water in careful proportion, and the ratio was a matter of real judgment. That's the origin of the image on the Temperance card. For centuries, medieval and Renaissance artists showed the virtue of Temperance as a woman pouring water into wine, and the early tarot kept the gesture. The word itself comes from the Latin temperare, to mix in the right measure, the same root as tempering, the heating and cooling that makes steel both hard and flexible. Temperance was never about abstinence. It's about proportion.
The card corresponds to Samekh, "prop" or "support," and to Sagittarius, the archer. Its path runs straight down the middle of the Tree of Life from Tiphareth, the heart, to Yesod, the Foundation, and Golden Dawn writers called it the path of the arrow, the direct line of aspiration. Aleister Crowley renamed the card "Art" in his Thoth deck and made it explicitly alchemical, the fusion of opposites into something new. In Waite's version the angel wears a triangle inside a square, spirit held within matter, and stands with one foot on land and one in water. The irises at the water's edge recall Iris, the Greek messenger goddess who walked the rainbow between heaven and earth.
Paul Foster Case read the Key as the process of testing and adjustment, the trial-and-error by which a life is refined. That's what makes it the most practical card in the deck. Almost nothing good comes from one dramatic overhaul. It comes from mixing, checking and adjusting again: work and rest, solitude and company, discipline and pleasure, in proportions that actually suit you.
The shadow is the imitation of balance: the lukewarm compromise, moderation as an excuse to avoid commitment, peace bought by never saying what you think. And there's plain excess, which the virtue was originally meant to correct. What in your life is badly out of proportion? Which two parts of you have never been introduced?
This is the card of the routine you can actually keep and the budget that leaves room for joy. Its lesson is learned the way steel is tempered, a little at a time and over and over. An image seen daily works on exactly that schedule, a small correction each morning: mix, taste, adjust.