I love this quote! The magic word in there, in my humble opinion, is "believe". Many people conceive great ideas and dreams, but never achieve them, because they don't really believe that they can. Therefore, millions of people end up being unfulfilled, and "wishing" for that proverbial boat to come in.
Wishing is not the same as believing. Your beliefs become the core of who you are. It dictates how you think, how you speak, and how you act. You take control, where wishes are lost in the eternal ether.
So go ahead... conceive a goal for 2018, and let your belief that you can reach it shape you into becoming the person you need to be, in order to achieve it.