Spells are not wished to life, they are cast with action and purpose. Contrary to popular belief, most spells don't actually require the waving of a magical wand, but instead the magician's own hands and will. From simple snaps to complicated hand gestures, all movements of the hands are used to harness magical energy from the Wellspring and produce the desired magical effect(s).
But a spell needs something more than hand movements and the proper knowledge of its Circumstances. Along with the physical aspects of magic, the psychological aspects of magic are crucial to properly performing a spell.
Magic is based on something powerful within a magician, much like willpower. It is a focused intensity, a clear view, an unwavering sureness. For a spell to work, it has to be done from the heart. The magician has to have no doubt that the spell will work, and needs to intend to do that spell wholeheartedly.
More complex works of magic such as those used for healing, curses or invocations require the use of external ingredients like herbs, candles, incantations, and symbols or tools to focus the intention of the magician, such as wands.