Rationalist is a term used to describe a person who believes in the power of reason and logic. It is related to the term Deist, which is a person who believes in a higher power but does not necessarily follow any organized religion. Rationalists believe that knowledge can be gained through observation and experimentation, and that faith should not be a factor in decision-making. They also reject the idea of supernatural forces or divine intervention. Rationalists are often associated with the Enlightenment period of the 18th century, when many thinkers began to question traditional religious beliefs and embrace scientific inquiry.