Miguel de Unamuno's quote "Science is a cemetery of dead concepts" is a reflection on the nature of clinical progress. He suggests that science is a graveyard of concepts that have been disposed of or disproven. This indicates that science is constantly progressing and that the concepts of the past are no longer pertinent. It also suggests that science is a procedure of trial and error, where concepts are checked and disposed of until the right one is discovered. This quote is a reminder that science is a vibrant field, which the ideas of the past are not always the same as the ideas of the present. It is a pointer that science is constantly altering which the concepts of the past may no longer apply.
