Priori Knowledge

A priori knowledge is knowledge that can be known independently of experience. It does not depend on observation or experiment but is understood through reason and logical thinking. Mathematical and logical truths are the most common examples of a priori knowledge. For instance, the statement 2 + 2 = 4 does not require testing in the physical world to be known as true. Once we understand the meanings of the numbers and their relations, the truth becomes clear through reasoning alone. Philosophers such as Bertrand Russell explain that a priori knowledge arises from understanding logical relationships between concepts or universals. Unlike scientific knowledge, which depends on observation and may change with new discoveries, a priori knowledge is considered necessary and universally true.