Science is exploration. The fundamental nature of exploration is that we don't know what's there. We can guess and hope and aim to find out certain things, but we have to expect surprises.
~ Charles H. Townes
Science has faith. We make postulates. We can't prove those postulates, but we have faith in them.
One of the things my family taught me - I think very important in religion and science - is that you must be ready to stand up for what you think. Decide what you really think is best, and stick with it.