This structure has to do with the interaction between our choices and our beliefs, and creates what is quite often a most annoying characteristic.

What we believe is a choice. That is, we choose what we believe, sometimes consciously, sometimes not. Then, once we have chosen what to believe, we believe what we have chosen, possibly even after large amounts of evidence imply that the belief is no longer a sensible choice, at least to most anyway. The structure indicates that belief subtracts from choice and then choice subtracts from belief.

This structure is considered to be the foundation of paradigms, and you are probably painfully aware of how difficult it is to change these.