Manifestation is based on the principle that like attracts like. Therefore, if you focus on negative things, you may attract more negative things into your life. However, it is important to note that manifestation is not about controlling everything that happens to you. Life is full of ups and downs, and sometimes negative things happen even when you are doing your best to stay positive. The key is to focus on what you want, rather than things that trouble you, and to trust that life will bring you what you need when you need it.