James 2:18-19 KJV
18
Yea, a man may say, Thou hast faith, and I have works: shew me thy faith without thy works, and I will shew thee my faith by my works.
19
Thou believest that there is one God; thou doest well: the devils also believe, and tremble.
Mark 9:23 KJV
23
Jesus said unto him, If thou canst believe, all things are possible to him that believeth.