I don't approve of the abuse of magic. It is something that comes from outside the natural world. It is an essence that has mass and energy within the realm it comes from.
In The Undiscovered Country Spock said something quite dramatic when he stated that " Nature abhors a vacuum. " That is as true on this plain of existence as it does on any other of the several material planes. Anything drawn from a place must be exchanged for something of equal mass. Magic is, as I've stated an energy and the more powerful the energy, the more powerful the drain on the essence that needs to be returned. The only essence that living beings upon this world has to offer up is the essence and energy of life itself. This is why incredibly strong magic must be generated with a confined group, lest the entire reservoir of life energy be consumed and the practitioner expires. This has happened many times before and why their are schools where learning is done under the watchful eye of a master of the art.
In my world magic is used seldom and the only practitioner, in my group, is the Feliniod, who dabbles only in the healing arts. She must first evaluate the level of life energy within the person she is trying to heal. Such a thing is important, since the life essence known by her species as Kin (Pronounced KEEN) is attacked in an equal proportion to the wound in the body itself. A small wound is with a mixture of herbs, salves and if necessary, minor healing magic and has little drain on the kin. A more severe wound which needs days, if not weeks to heal needs to be addressed with a more personal route.
This requires the healer to draw magic from the void into the natural world, which sends and equal level of their life essence back into that void. Then the practitioner needs to draw the tainted life essence out of the person they are trying to heal and replace that with the healing magic they now hold inside of them. Once this is done then the practitioner needs to quickly difuse the tainted magic back out of her body and force it into the void. This tainted or wounded life essence has a considerably lower level of mass than the life essence that was used to replace it, so when it is successful placed withing the void, only a small portion of what the practitioner originally placed inside the void will return to her. What this means is that a lone healer can only heal a certain level of wounds or number of wounded. If she over does it she could pass out, go into a coma or in certain events kill herself. There has been known, times which the practitioner and the wounded person have lost their lives together.
It is thought that since life is a form of energy, those living draw their energy from the void, when they are born. The reason that little ones have so much energy is that this energy is freshly drawn from the void and they as living being utilize the portion they originally withdrew, to the ending of their lives. What is left over of this energy, when the person expires is returned to the void.
It is taught that this used essence is of far less mass than was taken out at birth and according to these species, the void being slowly depleted as time goes on and at some time in the future will implode on itself and those still living will have their essence ripped from their bodies as the void collapses. This is why the ideal of sacrifice is so prevalent in their society. This dosen't mean that they take their own lives, but it does mean that they are unmindful of their own selves in battle and they will defend what they hold as valuable to the death. If they are killed defending their or others honor, they will add their life essence back into the void and the younger they are at death, the more massive force returns to the void. To them they are extending the existence of the void, which in their culture benefits all who live on.
This truth is embraced by the entire species of felinoid The character comes from and is a strong part of their culture. This is why these creatures are so aggressive hunters and protectors. What they hold inside of them is a gift and needs to be shared. they just have a very narrow view of those who deserve to share this experience with. They have a deep and abiding sense of honor and to be a friend or an enemy to them it pretty much a lifetime ordeal.