" Whether one agrees with all, some, or none of Avicenna’s tenets, there is no doubt that his disease concept in Unani is a sound one. It is truly amazing that an eleventh-century physician could have had this incredible power of observation, understanding of biological nature, and ability to synthesize and communicate his science. This truth logically makes one wonder whether we really need to expend all the trouble, time, and expense on the latest state-of-the-art technologies to effectively diagnose a disease! "

― Avicenna , القانون في الطب