The Temperance card in a tarot deck is ruled by Sagittarius. A Sagittarius can be hard is to interpret, but never uninteresting!...
...So this is how the story goes, from the tarot perspective: continuing on his spiritual path, the Fool begins to wonder how to reconcile the opposites that he's been facing: material and spiritual (which he hung between as the Hanged man), death and birth (the one leading into the other in the Death card). It is at this point that he comes upon a winged figure standing with one foot in a brook, the other on a rock. The radiant creature pours something from one flask into another. Drawing closer, the Fool sees that what is being poured from one flask is fire, while water flows from the other. The two are being blended together! "How can you mix fire and water?" the Fool finally whispers. Never pausing the Angel answers, "You must have the right vessels and the right proportions." The Fool watches with wonder. "Can this be done with all opposites?" he asks. "Indeed," the Angel replies, "Any oppositions, fire and water, man and woman, thesis and anti-thesis, can be made to harmonize. It is only a lack of will and a disbelief in the possibility of unity that keeps opposites, opposite." And that is when the Fool begins to understand that he is the one who is keeping his universe in twain, holding life/death, material world and spiritual world separate. In him, the two could merge, as in the vessels that the Angel uses to pour the elements, one to the other. All it takes, the Fool realizes, is the right proportions....and the right vessel.
The symbolism of an Angel represented in the card is very precise, for Sagittarius is the sign of merging seemingly impossible opposites: a "winged" being/person from Heaven on Earth; a centaur, both beast and man in a unique creature; best of all, there is the bow and arrow, one moving, one stationary, working together to point the way. Temperance may be, at first glance, a warning to "temper" behavior, which could be fitting in the skillful use of diplomacy and negotiation to reach equilibrium or a middle path, searched by Sagittarius. But it may also be a reminder of the power of imaginative and expansive thinking: that seemingly irreconcilable opposites may not be irreconcilable at all. Belief that fiery red and watery blue cannot be merged may be the only thing standing in the way of blending the two - change the belief, measure out each with care, and you can create otherworldly violet. ...the possibility of a balanced life, with spiritual, emotional and material needs met - a "tempered" satisfaction with life's gifts!!!
I personally envision "magic" and "miracle" here: I see "alchemy" happening and the harmony and integration of both sides of one same thing. To me it is the Sagittarian desire to find a unified field theory, a way of blending opposites, achieving synthesis. The Temperance card announces that thesis and anti-thesis can and should be put together to get the even more useful synthesis. It is the coming true of a dream or a fantasy of unity through individuality. It requires experimentation, concentrated work, time, care, patience, yet it is possible. The result is the most marvelous blend. It is also a reminder that a bow and arrow are useless apart, but together a formidable artifact.
