What happens if you cast a spell on someone?

Casting a spell is very common practice known in every type of belief. The spell takes its form depending to what you intend to do however some spells do backfires to the caster.

If you cast a love spell to someone, that person will love you however the spell must be well cast otherwise you can get the oposite of love. Its the same to other spells so the major point is the intention of casting the spell that gives it its outcomes.