The wonderful thing about life is that it really is a long, long, vision quest. As you search and seek (not hide and seek), you send out energy to the Universe, telling the Universe what you want. The Universe responds to thoughts, words, and energy, and She does her best to send what you need back to you. It's really a lot like little kids sending out letters to Santa, outlining their wishes for Christmas presents.
When you receive what you have asked for, the cool phrase that describes the process is "manifesting". You have manifested your desires. What are the prerequisites? That the wish is good for all and harms no one. Therefore, you cannot wish for people to become ill or to die, or to be harmed.