We can also do this without the key words in the premises being based on anything we can understand or verify empirically. Science can only deal with what can be observed in some way; logical relations between premises cannot be observed. Since science requires reason in order to begin to explain reason, to argue that it can somehow justify our ability to reason would be tantamount to arguing in a circle. Science is a useful tool to help us understand the world, but it has many limitations (see Chapter 12).
