The true power behind casting spells is knowing what you want to manifest and stating it clearly. Not being clear in one’s mind, and not knowing one’s own intentions, will be at the very least, ineffective. At worst, one may get undesirable outcomes. If the persons desires are not thought out, and they are cloudy, and uncertain, the results of the spell will be the same.
So, what is "intention?" Intention is the formulated thought process of Will. When the thought process is well formulated, imbued with conviction, and is consistent, then intention is a powerful vehicle to achieve goals. The human spirit signals to the Universe, and the Universe response in turn. When good intention is well annunciated with good incantation and spell-work the outcome will more likely be favorable.
For Wiccans magickal spells are often performed with the use of herbs, oils, crystals, cauldrons, athames, wands, pentacles, potions, altars and etc. The tools of the spell-caster are important, but some Spiritualists need very little, if any, articles to cast their spells. It really depends on the skills and the experience of the practitioner.
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